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】

試題分析： 句意：直到實驗結(jié)果被宣布才能得出關(guān)于新產(chǎn)品的結(jié)論。Until引導的是時間狀語從句，用的是現(xiàn)在完成時，代替將來完成時，所以主語用一般將來時，選C。

考點：考查時態(tài)

 

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