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
【答案】
D
【解析】
四个选项分别表示可以、能、将要和应该,根据题意选D,要求中清晰地写明了,飞机起飞前三十分钟,所有乘客都应该检查后登机。
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