2. 专升本
  3. We can separate the mixture into the pure chemical compounds______it is composed.

We can separate the mixture into the pure chemical compounds______it is composed.

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问题 We can separate the mixture into the pure chemical compounds______it is composed.
选项 A、in which
B、of that
C、of which
D、from which
答案C
解析 Be composed of固定搭配，表示“由……组成”。本题考核由“介词+关系代词”引导的定语从句，只能用which，不能用that，所以选C。
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