It is written clearly in the requirements that all passengers check onto board thirty minutes before the plane takes off. A．mayB．canC．willD．shall 题目和参考答案——青夏教育精英家教网—

题目内容

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

shall作为情态动词，用于第二，三人称中表示许诺，警告，命令的意思。

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