Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.

A. having left ????????????? ????????????? B. to leave? ????????????? ????????????? ????????????? C. left? ????????????? ????????????? ????????????? ????????????? D. leaving

 

【答案】

C

【解析】

試題分析：句意：很多省份都遭遇了霧霾，如果任由問題不解決，它會導(dǎo)致更嚴重的后果。這里if條件句是省略式，完整的是If the problem is left unsolved，…，如果主從句的主語一致的話，可以省略從句的主語和be動詞，所以選C。

考點：考查省略句

 

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