Water enters into a great variety of chemical reactions, ______ have been mentioned in previous pages.

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问题 Water enters into a great variety of chemical reactions, ______ have been mentioned in previous pages.

选项 A、a few of it
B、a few of them
C、a few of that
D、a few of which

答案D

解析本题考查定语从句。该句意为“水参与大量的化学反应，其中有几个在前几页中已经提及”。非限制性定语从句和主句之间一般以逗号隔开，由which，who，whose引导，也可用when， where，as来引导，不用that。which所指代的名词所需搭配的介词应置于which之前。D项正确。

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