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.

admin2009-05-28  29
问题 Once environmental damage ______, it takes many years for the system to recover.
选项 A、has done
B、is to do
C、does
D、is done
答案D
解析
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