考试
2020-03-16 06:40:25

1258 Once environmental damage

题目描述

Once environmental damage_____, it takes hundreds of years for the system to recover.A.has



Once environmental damage_____, it takes hundreds of years for the system to recover.

A.has done

B.is to do

C.does

D.is done

请帮忙给出正确答案和分析,谢谢!

答案解析

D本题综合考查动词的时态和语态。句中主句

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