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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GCT工程硕士（英语）

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