We all know that, ______, the situation will get worse.
A.not if dealt carefully with
B.if not carefully dealt with
C.if dealt not carefully with
D.not if carefully dealt with
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B解析思路分析：空白处是一个状语从句简化成的分词短语用作状语。它可还原成if the situation it not carefully dealt with，省考主语the situation（因与主句主语一致）和be动词is，便成为正确的分词形式，故B项结构正确。
【点评】该题考查分词作状语。偏难。分词作状语时首先要求分词的逻辑主语和句子的主语要一致，当分词表示的动作与主语之间为主谓关系时，用现在分词，为动宾关系时用过去分词，考生应牢记这一规则。