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31． Personal computers in 1976． It has changed the whole world． A． are invented B． invented C． were invented D． have been invented 【查看更多】

 

題目列表(包括答案和解析)

Personal computers        in 1976．It has changed the whole world．

A． are invented                    B． invented     

C． were invented                   D． have been invented

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Personal computers ________ in 1976．It has changed the whole world．

[　　]

A．have been invented

B．was invented

C．were invented

D．are invented

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Personal computers ________ in 1976．It has changed the whole world．

[　　]

A．have been invented

B．are invented

C．were invented

D．invented

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Personal computers ________ in 1976．It has changed the whole world．

[　　]

A．have been invented

B．are invented

C．were invented

D．invented

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Personal computers ________ in 1976. It has changed the whole world.

[　　]

A．have been invented

B．are invented

C．were invented

D．invented

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