The digestive enzyme pepsin breaks down proteins into components_____readily absorbed by the human body.

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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 语法类试题(限制性定语从句)。that作关系代词,引导限制性定语从句,在从句中作主语或者宾语。因此,本题应选A。
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