Question

【题目】All passengers ________ go through safety check before they take a plane.

A.canB.mustC.mayD.ought

Answer 1

【答案】B

【解析】

句意：所有乘客在乘飞机前必须经过安全检查。

考查情态动词辨析。can能；must必须；may可能；ought和to连用，表示应该，根据所给空后面的go through safety check before they take a plane可知，应该是必须，故选B。