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The experiment can’t have been completed in such a short time,___?

A. can it B. was it

C. has it D. is it

 

C

【解析】

试题分析:考查反义疑问句。can’t + have done , 反意疑问部分常用现在完成时。有过去的时间状语,则用一般过去时。句意:在这么短的时间内试验是不可能完成的,不是吗?

考点:考查反义疑问句

 

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