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问题

When ________ personal computers ________ — In 1971.

A:was; discovered
B:were; invented
C:were; discovered
D:was; invented;
正确答案是:
同类题型

I went to London, I was stronglyimpressed with the beautiful buildings.

Tom, _____________ other boys , ___________ playing computer games.

e always keep an appointment,Jenny’– Seldom, ______.

Jane can’t attend the meeting at 3 o’clock this afternoon because she ______ a class at that time.

We ____ each other since childhood.

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