The personal computer _____ in 1976.  It has changed the whole world.

A. has been invented
B. is invented
C. was invented
D. invented
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科目：初中英語 來源：同步題 題型：單選題

The personal computer _____ in 1976.  It has changed the whole world.
[     ]
A. has been invented
B. is invented
C. was invented
D. invented

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