2. 外语
  3. In any environment______a limit to the resources that are available for any particular species.

In any environment______a limit to the resources that are available for any particular species.

admin2019-07-01  45
问题 In any environment______a limit to the resources that are available for any particular species.
选项 A、there is
B、where
C、by which
D、maybe
答案A
解析 The main clause needs a subject and a verb: there is.
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