2. 外语
  3. When we breathe, oxygen is passed to special molecules in the blood,______it to the muscles.

When we breathe, oxygen is passed to special molecules in the blood,______it to the muscles.

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问题 When we breathe, oxygen is passed to special molecules in the blood,______it to the muscles.
选项 A、is carried
B、carried
C、which carry
D、will carry
答案C
解析 Which carry introduces an adjective clause that modifies molecules.
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