The environmental problems in China may worsen if unsolved.A．making B．remained C．keeping D．left 题目和参考答案——青夏教育精英家教网—

The environmental problems in China may worsen if __________ unsolved.

A．making

B．remained

C．keeping

D．left

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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