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

游客2024-09-24  12

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、For
C、Since
D、While

答案 D

解析 本题考查连词。分析题干可知,前后两个句子属于转折关系,而非因果关系。[A]、[B]、[C]均表示因果关系,只有[D]While可以表示转折关系,意为“虽然”,故为答案。
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