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    【题目】Before you hand in your final report, ________ there are no spelling mistakes.

    A. make sure B. to make sure

    C. made sure D. making sure

    【答案】A

    【解析】

    试题分析：考查句子结构。本句中有before引导的时间状语从句，说明横线句是一个完整的句子，而BCD三项都不能放在句首先从单独的句子，而A项动词原形放在句首构成祈使句。句意：在你上交最终的报告之前，要确保没有拼写错误。故A正确。

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