单项选择题

At the policeman's signal, the vehicle pulled up.

A. stopped
B. slowed down
C. sped up
D. turned up
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单项选择题
Numerous attempts have been made to hide the truth.
A. Many
B. Successful
C. Effective
D. Unsuccessful
单项选择题
The cause of the fire is being investigated.
A. looked after
B. looked through
C. looked forward to
D. looked into
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