单项选择题

When I last saw them, the police had chased the robbers down Columbus Street（）.

A．were chasing
B．was chasing
C．chased
D．were on a chase

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单项选择题
In our own galaxy, the Milky Way, there are perhaps 200 billion stars,a small part of themprobably have planets on which life is feasible（）.

A．a small fraction in which
B．a small fraction of which
C．a small fraction which
D．which a fraction of
单项选择题
All don't have a free ticket must pay the admission fee（）.

A．Everyone who doesn't have a free ticket
B．No one who doesn't have a free ticket
C．No one who has free tickets
D．Anyone who has free tickets
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