摘要：31． 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． are invented B． invented
C． were invented D． have been invented
查看习题详情和答案>>Personal computers ________ in 1976．It has changed the whole world．
[ ]
A．have been invented
B．was invented
C．were invented
D．are invented
Personal computers ________ in 1976．It has changed the whole world．
[ ]
A．have been invented
B．are invented
C．were invented
D．invented
Personal computers ________ in 1976．It has changed the whole world．
[ ]
A．have been invented
B．are invented
C．were invented
D．invented
Personal computers ________ in 1976. It has changed the whole world.
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A ．have been invented |
B ．are invented |
|
C ．were invented |
D ．invented |