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 逻辑关系词题。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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