2. 考研
  3. Earthworms occur ______adequate moisture and food and the necessary soil conditions are found.

Earthworms occur ______adequate moisture and food and the necessary soil conditions are found.

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问题 Earthworms occur ______adequate moisture and food and the necessary soil conditions are found.
选项 A、and
B、whenever
C、however
D、wherever
答案D
解析 此句空白处需填入一个从属连词，而且从句是表示地点的状语从句。
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