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
The result of the experiment was not ______to publish.
A．interesting enough
B．too interesting
C．enough interesting
D．so interesting
单项选择题
We ______the help he gave us when we moved to our new house.
A．thanked
B．appreciated
C．obliged
D．owed
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