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. He is the best student of the three.among“在……当中”,相当于…plastics are the most common among synthetic materials。
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