【題目】The passengers show their ID cards before getting on the plane.

A.mightB.mustC.couldD.can

【答案】B

【解析】

句意:乘客們在登機(jī)前必須出示他們的身份證。

考查情態(tài)動(dòng)詞用法。might可能,可以;must必須;could可以;can可以。四個(gè)選項(xiàng)中,只有must語氣最強(qiáng)硬,表示“必須做某事”。故選B。

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