【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】

試題分析：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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