单项选择题

All factories and mines are ______ by government officials.

A．examined
B．surveyed
C．inspected
D．investigated
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单项选择题
Many automobile accidents were ______ careless driving.
A．attributed to
B．resulted in
C．contributed to
D．raised from
单项选择题
I don't know why he ______ in the middle of a sentence.
A．broke away
B．broke out
C．broke through
D．broke off
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