题目内容
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提问人:网友maldinizhu
发布时间:2022-01-06
[主观题]
(As you know that) you must (check in) at least 30 minutes (before takeoff) for (most flig
(As you know that) you must (check in) at least 30 minutes (before takeoff) for (most flights).
A.As you know that
B.check in
C.before takeoff
D.most flights
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