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.

admin2010-06-03  23
问题 Once environmental damage      , it takes many years for the system to recover.
选项 A、had done
B、is done
C、is to do
D、does
答案B
解析 damage与谓语“做”之间是被动关系，所以用is done。
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