Question

I always sleep with windows open _______ it is too cold outside.

A．until	B．if
C．that	D．unless

Answer 1

D

试题分析：句意：我总是开着窗户睡觉除非外面很冷。until  直到；if   如果； that那；unless除非。根据前后句子句意可知该选D。