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

A. can B. may C. must D. ought

【答案】C

【解析】句意:在所有的乘客坐飛機之前他們必須經(jīng)過安檢。can能,表示能力;may可以,表示允許;must必要,表示要求;ought應(yīng)該,表示責(zé)任和義務(wù)。結(jié)合句意,坐飛機要進行安檢,這是一個要求,故用情態(tài)動詞must,故選C。

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