【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：外面太冷了，你不要出去，除非用厚衣服完全裹起來。A項(xiàng)”如果“；B項(xiàng)”除非“;C項(xiàng)”一旦“；D項(xiàng)”當(dāng)....時(shí)“�！眜nless fully covered“為”連詞+省略結(jié)構(gòu)“補(bǔ)充完事為”unless you are“。故選B項(xiàng)。

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