单项选择题

______ does Mary write to her father Twice a week.

A．How long
B．How often
C．How far
D．How soon
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单项选择题
By the end of this year we ______ our new school into a strong modern one.
A．will be building
B．will have built
C．shall build
D．are going to build
单项选择题
John had to have his radio ______ in town.
A．repaired
B．repairing
C．to repair
D．repair
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