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The environmental problems in China may worsen if __________ unsolved.

A. making                             B. remained                         C. keeping                            D. left

 

【答案】

D

【解析】

试题分析:考查动词和状语从句的省略式:句意:中国的环境问题如果任由不解决会更严重的。四个选项都可以接过去分词unsolved,make使得,但是应该是被动式,remain仍然,应该是主动式,keep保持,应该是被动,leave使…保持…状态,也是被动,只有D项符合。在if和left之间省略了they are。选D。

考点:考查动词和状语从句的省略式

 

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