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