单项选择题

They tried to restrict access to ______ they believed to be dangerous areas.

A. which
B. what
C. that
D. everywhere
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单项选择题
As a ______ actor, he can perform, sing, dance and play several kinds of musical instruments.
A. sophisticated
B. flexible
C. versatile
D. productive
单项选择题
Televisions enable us to see things happen almost at the exact moment ______.
A. which they are happening
B. they are happening
C. which they happen
D. they have happened
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