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Alotofflightswerebecauseofthesmog(雾霾)lastmonth.A)putdownB)putupC)putoffD)putout

题目详情

 A lot of flights were _______ because of the smog(雾霾)last month.

        A) put down     B) put up           C) put off      D) put out

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答案和解析
C