单项选择题

Government reports, examination, and most business letters are the main situation formal language is used.

A．in which
B．at which
C．on which
D．in that
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单项选择题
Scholars maintain that social development can easily __ language changes.
A．bring up
B．bring about
C．bring out
D．bring forward
单项选择题
The road is wet, it ______ rained last night.
A．would have
B．should have
C．could have
D．must have
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