【題目】It is so cold that you can't go outside_____ fully covered in thick clothes.
A.if
B.unless
C.once
D.when

【答案】B
【解析】句意: 天太冷了,除非穿上厚衣服否則你不能出去。A. if”如果“;B. unless”除非“;C. once”一旦“;D. when”當“。根據(jù)句意故選B。

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