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As we all know,________, the pollution will get worse and worse.
A.not if carefully dealt with
B.until not carefully dealt with
C.if not carefully dealt with
D.when not carefully dealt with
C

试题分析:考查过去分词。本句的主语是the pollution ,和动词deal with构成逻辑上的被动关系,用被动态。而主句中已有谓语,动词短语deal with只能用非谓语形式,根据句意,如果不小心处理的话,故选C。句意:我们都知道,如果不小心处理的话,污染会恶化。
点评:考查非谓语动词的用法,关键是要找到非谓语动词的逻辑主语,看动词或动词短语和其逻辑主语构成什么关系,主动还是被动。
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