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
四個(gè)選項(xiàng)分別表示可以、能、將要和應(yīng)該，根據(jù)題意選D，要求中清晰地寫(xiě)明了，飛機(jī)起飛前三十分鐘，所有乘客都應(yīng)該檢查后登機(jī)。
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