2. 外语
  3. ______much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in th

______much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in th

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问题 ______much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.
选项 A、Because
B、Since
C、As
D、While
答案D
解析 状语从句。根据句义可知，空处所缺为让步状语从句的连接词，故选while(尽管)；much as也可引导让步状语从句，但as much不可以。
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