【題目】Check your answers carefully and make some changes ______.

A. if you are convenient B. if not

C. if it necessary D. if necessary

【答案】D

【解析】

試題分析：狀語從句的省略考查。句意：仔細(xì)檢查你的答案，有必要的話做一些改變。這時一個狀語從句的省略結(jié)構(gòu)。在狀語從句中如果從句的主語與主語一致或者從句的主語為it , 并且從句的謂語中含有be 動詞，那么可以省略從句中的主語和be 動詞。此句完整的從句應(yīng)為if it is necessary. 將it is 省略后D為正確選項。

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