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 that作关系代词，引导限制性定语从句，在从句中作主语或宾语，如：This is the best movie that I have ever seen this year．这就是我今年看到的一部最好的电影。
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