.It is written clearly in the requirements that all passengerscheck onto board thirty minu

发布时间：2020-08-16 09:26:59

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It is written clearly in the requirements that all passengers    check onto board thirty minutes before the plane takes off.
A. may
B. can
C. will
D. shall

网友回答

A. may
B. can
C. will
(答案→)D. shall
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