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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单项选择题
It is obvious that there is difference in the way they view the matter.
A. natural
B. certain
C. inevitable
D. clear
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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