【題目】The captain says that all the seatbelts ______ be fastened(抓緊)before the plane takes off.

A.canB.mayC.mustD.should

【答案】C

【解析】

句意:機長說飛機起飛前必須系好所有的安全帶。

can能,表示有能力;may可以,表示允許;must必須,表示主觀上認識有必要;should應該,(常用于糾正別人)應該,應當,(提出或征詢建議)該,應當。根據(jù)before the plane takes off可知此處指必須系好安全帶,故選C。

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