2. 外语
  3. The main function of the hormone is to control the body’s biological clock, ______ we know when to sleep and when to wake.

The main function of the hormone is to control the body’s biological clock, ______ we know when to sleep and when to wake.

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问题 The main function of the hormone is to control the body’s biological clock, ______ we know when to sleep and when to wake.
选项 A、in order
B、in case
C、even if
D、so that
答案D
解析 句子前半部分提到荷尔蒙的功能，后半部分提到具体的作用，之间的关系为因果关系，故so that“因此，结果”正确。in order表示“为了”，需要that连词才能引导从句：in case表示“万一”，even if表示“即使”。
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