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        1. 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(guò)安檢。故選C。
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