题目内容
（请给出正确答案）
A.has left
B.had left
C.left
D.was left
参考答案
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
网友提供的答案
更多“It is four years since John（）school”相关的问题
Tony Huesman, a heart transplant recipient (接受者) who lived a record 31 years with a single donated organ has died at age 51 of leukemia (白血病), but his heart still going strong. "He had leukemia," his widow Carol Huesman said, "His heart—believe it or not—held out. His heart never gave up until the end, when it had to."
Huesman got a heart transplant in 1978 at Stanford University. That was just 11 years after the world&39;s first heart transplant was performed in South Africa. At his death, Huesman was listed as the world&39;s longest survivor of a single transplanted heart both by Stanford and the Richmond, Virginia-based United Network for Organ Sharing.
"I&39;m a living proof of a person who can go through a life-threatening illness, have the operation and return to a productive life," Huesman told the Dayton Daily News in 2006.
Huesman worked as marketing director at a sporting-goods store. He was found to have serious heart disease while in high school. His heart, attacked by a pneumonia (肺炎) virus, was almost four times its normal size from trying to pump blood with weakened muscles.
Huesman&39;s sister, Linda Huesman Lamb, also was stricken with the same problem and received a heart transplant in 1983. The two were the nation&39;s first brother and sister heart transplant recipients. She died in 1991 at age 29.
Huesman founded the Huesman Heart Foundation in Dayton, which seeks to reduce heart disease by educating children and offers a nursing scholarship in honor of his sister.
Tony Huesman died from ____________.
A.heart failure
B.heart transplant
C.pneumonia
D.non-heart-related disease
At the beginning of 1969, the United States set up a group that specially researched the development direction of spaceflight with 【5】 for the next stage,【6】by deputy president. After【7】and research, it suggested that an aero craft with great benefits in【8】should be made, eg【9】the spaceflight being its leading stanchion. In this project, five orbit implements were prescribed to be made, 【10】" Exploitation", " Columbia", " Challenger", "Discovery" and "Atlands".
In 1970, spaceflight got into an all-round【11】of research and manufacture. The whole-project had to delay more than three years. Five orbit implements were【12】to be four and flight experiment for six times was also decreased for four,【13】the number of production was cut down, according to the original scheme. In April 1971 this【14】was decided that Kennedy Space Centre was used for the launching and landing port for space shuttles, and Edwards Air Base was used for the 【15】 landing port. In February 1977,"Exploitation" Orbit Implement started to have entering and landing experiment sin Edwards Air Base. From May 12, 1981 to July 4, 1982, "Columbia" Space Shuttle successfully finished four flight experiments for research and manufacture,【16】meant that the【17】and manufactures were over in【18】form.
It【19】about 12 years and cost more than 75 billion US dollars to finish the whole project. On November 11, 1990, space shuttles began to fly for【20】.
(1)
A．what
B．which
C．where
D．that
Four years of prep school should ______ those children.
A．wax
B．purify
C．polish
D．filter
A．Three years.
B．Almost four years.
C．Two years.
D．Three years and one semester.
A.bookstore
B.department store
C.company
D.school
A．Two to four months.
B．About three weeks.
C．At least half a year.
D．Two years or more.
警告：系统检测到您的账号存在安全风险
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
