Once damage______, it takes many years for the natural environment to recover.A、

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问题 Once damage______, it takes many years for the natural environment to recover.

选项 A、has done
B、is to do
C、is to be done
D、is done

答案 D

解析这是一道语法题，考点是动词的时态。该句子讲的是普遍真理，因此要用一般现在时。

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