题目内容
21、____ is the case with humans, animals also love their babies.
A. Which B. When C. What D. As
试题答案
21、D
解析：定语从句.此处as是关系代词，引导非限制性定语从句，且在从句中做主语.which引导非限制性定语从句时，不能置于句首.
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