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题目内容
There are, as yet, no vegetation types or ecosystems whose study has been(i)_____ to the extent that they no longer(ii)_____ ecologists.
- Aperfected.. hinder
- Bexhausted.. interest
- Cprolonged.. require
- Dprevented.. challenge
- Edelayed.. benefit
B显示答案
以上解析由 考满分老师提供。