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

游客2024-01-02 7

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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