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    【题目】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】

    试题分析：状语从句的省略考查。句意：仔细检查你的答案，有必要的话做一些改变。这时一个状语从句的省略结构。在状语从句中如果从句的主语与主语一致或者从句的主语为it , 并且从句的谓语中含有be 动词，那么可以省略从句中的主语和be 动词。此句完整的从句应为if it is necessary. 将it is 省略后D为正确选项。

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