Accordingtotheairtrafficrules,you

问题详情：

According to the air traffic rules, you ______ switch off your mobile phone before bearding.

A. may                        B. can                          C. would                     D. should

【回答】

D

解析：此题考查情态动词的用法。根据句意“按照空中交通规则，你应当在登机前关掉你的手机”，所以只有should(应该，应当)符合题意。

知识点：虚拟语气与情态动词

题型：选择题