I usually sleep with the window open（）it is very cold.
题目
I usually sleep with the window open（）it is very cold.
Aunless Bas Cif
答案
【选 A】
I usually sleep with the window open (unless) it is very cold.
除非天很冷,不然我通常开窗睡.
A unless 除非
B as 因为
C if 如果
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