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 Theheavysmoggydayslastedforawinter,

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问题详情:

 Theheavysmoggydayslastedforawinter,

 The heavy smoggy days lasted for a winter, ______ a serious traffic confusion in northern cities.

      A. causing      B. caused                 C. having caused      D. being caused

【回答】

A

知识点:非谓语动词

题型:选择题

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