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No conclusion _________ about the new product until the result of the experiment has been announced.

A. is drawn B. was drawn C. will be drawn D. has been drawn

 

C

【解析】

试题分析: 句意:直到实验结果被宣布才能得出关于新产品的结论。Until引导的是时间状语从句,用的是现在完成时,代替将来完成时,所以主语用一般将来时,选C

考点:考查时态

 

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