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题目内容双击单词支持查询和收藏哦～
There are, as yet, no vegetation types or ecosystems whose study has been（i）_____ to the extent that they no longer（ii）_____ ecologists.
- A.perfected.. hinder
- B.exhausted.. interest
- C.prolonged.. require
- D.prevented.. challenge
- E.delayed.. benefit
B显示答案
以上解析由 考满分老师提供。
