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

A.canB.mustC.mayD.ought

【答案】B

【解析】

句意：所有乘客在乘飛機(jī)前必須經(jīng)過(guò)安全檢查。

考查情態(tài)動(dòng)詞辨析。can能；must必須；may可能；ought和to連用，表示應(yīng)該，根據(jù)所給空后面的go through safety check before they take a plane可知，應(yīng)該是必須，故選B。

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