As we all know,________, the pollution will get worse and worse.A．not if careful
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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 |
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答案
| C |
解析
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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