2. 外语
  3. Once environmental damage ______, it takes many years for the system to recover.

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

admin2014-03-31  108
问题 Once environmental damage ______, it takes many years for the system to recover.
选项 A、is done
B、will be done
C、has done
D、is to be done
答案A
解析
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