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【题目】_______ many scientists believe is ______the continuous presence of water benefits the earth a lot.

A. What, whichB. Which, that

C. When, thatD. What,that

【答案】D

【解析】

考查主语从句和表语从句。句意:许多科学家认为,水的持续存在对地球有很多好处。分析句子结构可知,第一空为主语从句, 从句中的believe缺少宾语,所以第一空用whatis后的部分表语从句,从句成分完整,所以第二空用that起连接作用,故D项正确。

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