【題目】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

【答案】C

【解析】

試題分析：考查狀語(yǔ)從句的省略。當(dāng)before、if、when、until、unless等引導(dǎo)的狀語(yǔ)從句主從句主語(yǔ)一致的時(shí)候，從句的主語(yǔ)可以省略，省略原則是當(dāng)從句謂語(yǔ)中包含be動(dòng)詞時(shí)，可以省略從句主語(yǔ)和be動(dòng)詞，保留be之后的部分，被保留部分常為現(xiàn)在分詞、不定式、過(guò)去分詞 、形容詞等。在此句中，完全結(jié)構(gòu)是：if the pollution is not carefully dealt with，在省略之后應(yīng)該選擇C，否定詞放在分詞之前。

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