問題詳情
48.______ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.
(A) Because
(B) For
(C) Since
(D) While
(A) Because
(B) For
(C) Since
(D) While
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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