易哈佛 \ 2018年大学英语四级

____ much is known about what occurs during sleep,...

2018年大学英语四级考点真题库

[单项选择题]____ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption

关键词: different sleep assumption
A.Because
B.For
C.Since
D.While

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