The digestive enzyme pepsin breaks down proteins into components______ readily a

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问题 The digestive enzyme pepsin breaks down proteins into components______ readily absorbed by the human body.

选项 A、that can be
B、and are
C、which they
D、are to be

答案 A

解析 that 做关系代词，引导限制性定于从句，在从句中作主语或者宾语。

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