It is written clearly in the requirements that all passengers _______ check onto board thirty minutes before the plane takes off．

A．mayB．canC．will D．shall

D

解析四個選項分別表示可以、能、將要和應該，根據(jù)題意選D，要求中清晰地寫明了，飛機起飛前三十分鐘，所有乘客都應該檢查后登機。

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