1 spent half an hour _________ this difficult math problem.A. having worked on
1 spent half an hour _________ this difficult math problem.
A. having worked on B. to work on C. on work D. working on
1 spent half an hour _________ this difficult math problem.
A. having worked on B. to work on C. on work D. working on
A. Lincoln’s Gettysburg Address has deep meaning. B. Lincoln’s Gettysburg Address is simple in style. C. Lincoln’s Gettysburg Address is memorized by every American school child. D. Lincoln’s Gettysburg Address is the greatest speech ever delivered in the United States.
A. to write B. written C. writing D. write
A. statement B. cause
C. words D. proof
A. release B. relive
C. reject D. relieve
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