单项选择题

About 10 years ago, you could hardly get（）information about the PC.

A、 no
B、 any
C、 some
D、 certain

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单项选择题
You are so clear about it; somebody（）you.

A、 would tell
B、 ought tell
C、 must have told
D、 should told
单项选择题
The professor of history is studying some major historical（）.

A、 incidents
B、 accidents
C、 events
D、 elements
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