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        1. 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(jī)之前都要經(jīng)過安檢。故選C。
          考點(diǎn):考查情態(tài)動(dòng)詞

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