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

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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