【題目】We all know that _____ carefully dealt with, the situation will get worse．

A．once B．when

C．if D．unless

【答案】D

【解析】

試題分析：考查連詞。句意：我們都知道除非認(rèn)真處理，否則局勢(shì)會(huì)變得更糟。unless除非，符合語境。

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