2. 外语
  3. Once damage______, it takes many years for the natural environment to recover.

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

admin2019-07-18  71
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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成人本科学位英语

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