As much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the r

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问题 As 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、For
D、While

答案D

解析 句意:尽管对睡眠过程中会发生的情况知之甚多,但对睡眠及其不同阶段的确切作用在很大程度上仍属猜想。该题考查句子之间的逻辑关系。根据much is known(知之甚多)和remains in the realm of assumption(属猜想)可知,前后分句构成转折关系。所以答案为D。
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