【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(jī)長說飛機(jī)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(rèn)識有必要;should應(yīng)該,(常用于糾正別人)應(yīng)該,應(yīng)當(dāng),(提出或征詢建議)該,應(yīng)當(dāng)。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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