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

A.mightB.mustC.couldD.can

【答案】B

【解析】

句意:乘客们在登机前必须出示他们的身份证。

考查情态动词用法。might可能,可以;must必须;could可以;can可以。四个选项中,只有must语气最强硬,表示“必须做某事”。故选B

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