It is so cold that you can’t go outside ________ fully covered in thick clothes._刷题宝

题干

It is so cold that you can’t go outside ________ fully covered in thick clothes.

A．if	B．unless
C．once	D．when

上一题下一题 0.85难度单项选择更新时间:2015-06-24 09:22:27

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