All passengers______go through safety check before they take a plane.
A．canB．may
C．mustD．ought
C

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(jī)之前都要經(jīng)過安檢。故選C。
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