All passengers______go through safety check before they take a plane.

A．can B．may
C．must D．ought

C

解析試題分析：can能，能夠；may可以，可能；must必須，一定；Ought應(yīng)該。句意：所有乘客在上飛機之前都要經(jīng)過安檢。故選C。
考點：考查情態(tài)動詞

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