Accordingtotheairtrafficrules,you

問題詳情：

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：此題考查情態動詞的用法。根據句意“按照空中交通規則，你應當在登機前關掉你的手機”，所以只有should(應該，應當)符合題意。

知識點：虛擬語氣與情態動詞

題型：選擇題