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、but
B、where
C、however
D、and

答案B

解析从空格前后内容可推知，空档及后面部分为一地点状语从句，因此，B为正确选择。

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GCT工程硕士（英语）

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