It is written clearly in the requirements that all passengers ______ check onto board 30 minutes bef...
2023-01-14 13:23:16 160次 2011-2012学年天津市高三年级第一次月考英语题 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It is written clearly in the requirements
that all passengers ______ check onto board 30 minutes before the plane takes
off.
|
A．may
|
B．can
|
C．will
|
D．shall
|
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