单项选择题

Televisions enable us to see things happen almost at the exact moment ().

A. which they are happening
C. which they happen
B. they are happening
D. they have happened

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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

单项选择题

() is announced in the papers, our country has launched a large-scale movement against smuggling and fraudulent activities in foreign currency exchange deals.

A. What
B. As
C. Which
D. That

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