【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：外面太冷了，你不要出去，除非用厚衣服完全裹起來(lái)。A項(xiàng)“如果”；B項(xiàng)“除非”；C項(xiàng)“一旦”；D項(xiàng)“當(dāng)……時(shí)候”。“unless fully covered”為“連詞+省略結(jié)構(gòu)”，補(bǔ)充完整為“unless you are”。故選B項(xiàng)。“連詞+省略結(jié)構(gòu)”省略了從句的主語(yǔ)（與主句主語(yǔ)一致）和主語(yǔ)后的動(dòng)詞be�？忌鷳�(yīng)根據(jù)前后句意判斷出前后邏輯關(guān)系，然后選擇正確答案。同時(shí)，考生要注意歸納這類(lèi)連詞：when, while“表示時(shí)間”；if, unless“表示條件”；once“表示時(shí)間或條件”；though/although, even if(though)表示“讓步”。

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