单项选择题

So far no one has been able to account for the cause of the accident.

A. assess
B. explain
C. describe
D. investigate
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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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