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This problem may lead to more serious ones if ________ unsolved.

[  ]

A.making

B.remained

C.keeping

D.left

答案:D
提示:

本题考查省略句的用法。此处完整的句子应为:This problem may lead to more serious ones if it is left unsolved.在从句中如果主语与主句的主语一致时,常将从句的主语和谓语的一部分省略(常常是be的形式)。


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