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--- Why was Professor Zhang unhappy rece...

--- Why was Professor Zhang unhappy recently?

--- Because the theory he insisted on _____ wrong.

A. proved              B. proving

C. being proved         D. was proved

 

A 【解析】 试题分析:句意:——为什么张教授最近不高兴?——因为他坚持的理论证明是错的。prove作"证明是;结果是;事实说明"解时,用作连系动词, 这时无被动语态。故选A. 考点:考查时态语态。  
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