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【题目】We don’t doubt ________ we will complete all the project before the year 2013.

A.when B.if C.that D.whether

【答案】C

【解析】doubt作动词,后跟宾语从句,在否定句中,跟that引导的宾语从句;在肯定句中后跟if/whether 引导的宾语从句。

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