Question

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

A.mustB.canC.mayD.need

Answer 1

【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。