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

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 that
C、a few of them
D、a few of which
答案D
解析 在“介词短语+which"结构中，which引导定语从句，该结构在从句中作状语，如：Sound is a tool by means of which people communicate ideas with each other．声音是一种人们彼此用来交流思想的工具。
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