【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。A項“如果”；B項“除非”；C項“一旦”；D項“當(dāng)……時候”。“unless fully covered”為“連詞+省略結(jié)構(gòu)”，補充完整為“unless you are”。故選B項。“連詞+省略結(jié)構(gòu)”省略了從句的主語（與主句主語一致）和主語后的動詞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，考生要注意歸納這類連詞：when, while“表示時間”；if, unless“表示條件”；once“表示時間或條件”；though/although, even if(though)表示“讓步”。

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