【題目】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】

試題分析：考查句子結(jié)構(gòu)。本句中有before引導(dǎo)的時(shí)間狀語從句，說明橫線句是一個(gè)完整的句子，而BCD三項(xiàng)都不能放在句首先從單獨(dú)的句子，而A項(xiàng)動(dòng)詞原形放在句首構(gòu)成祈使句。句意：在你上交最終的報(bào)告之前，要確保沒有拼寫錯(cuò)誤。故A正確。

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