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【题目】All the passengers ______ show their passports before getting on the plane.

A.mustB.canC.mayD.need

【答案】A

【解析】

句意:所有乘客登机前必须出示护照。

考查情态动词。must必须;can能够;may可以;need需要;根据“show their passports before getting on the plane”登机前必须出示护照,这个是法律法规,所以用必须,故选A。

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