单项选择题

The period ______ dance classes increases gradually from two or three hours a day to five or six.

A．referred to
B．kept to
C．attached to
D．given to
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单项选择题
______ ,we couldn't work in the small room where there is no air conditioner.
A．Being a hot day
B．It being a hot day
C．It being hot a day
D．Because the day being hot
单项选择题
The ______ of marriage is still popular despite the high divorce rate.
A．institution
B．debate
C．institute
D．university
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