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问题详情

"Once environmental damage _______, it takes many years for the system to recover."

A、has done

B、is to do

C、is done

D、does

时间：2021-07-17 18:29 关键词：

答案解析

C

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Once environmental damage _______, it takes many years for the system to recover.
"Once environmental damage _______, it takes many years for the system to recover."