______much is known about what occurs during sleep, the precise function of slee

游客2023-11-13  21

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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