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【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:所有乘客在乘飛機前必須經過安全檢查。

考查情態(tài)動詞辨析。can能;must必須;may可能;oughtto連用,表示應該,根據所給空后面的go through safety check before they take a plane可知,應該是必須,故選B。

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