2. 外语
  3. There are many kinds of synthetic materials,______ plastics are the most common.

There are many kinds of synthetic materials,______ plastics are the most common.

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问题 There are many kinds of synthetic materials,______ plastics are the most common.
选项 A、between which
B、of which
C、in which
D、among which
答案D
解析 关系代词which替代的是synthetic materials，实际上要求选择的是介词。between 指两者之间，而句子中是many kinds，of 在与形容词最高级连用表示比较范围时，多用于all 等确定的范围，如of all the synthetic materials，plastics are the most common，而句中的many是个不确定的概念。in在表示比较范围时，后接的名词多有整体范围的含义，试比较：He is the best student in his class．H
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