说明
对比下列句子：
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I want to go somewhere where it's quiet. 我想去个安静的地方。
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They must go wherever we send them. (CGEL) (wherever 引出地点状语从句, 并在从句中做状语) 我们派他们去哪里, 他们就得去哪里。
请做下面的英语试题：
Earthworms occur ____ adequate moisture and food and the necessary soil conditions are found. A. and B. but C. however D. wherever(TOEFL)