题目内容
(请给出正确答案)
[单选题]
The airport is usually your first stop before ______ on your vacation or trip.
A.leave
B.leaving
C.left
D.to leave
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A.leave
B.leaving
C.left
D.to leave
第2题
You must ______ at the airport an hour before your plane leaves.
A.check in
B.check out
C.check up
D.check on
第4题
Your should first know whether any jobs are ______ before application.
A.opened
B.hired
C.available
D.variable
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