单项选择题

There is no point() the piano, unless you practise every day.

A．to learn to play
B．by learning to play
C．in learning to play
D．having learned to play

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单项选择题
When I visited your country again last year I found it completely().

A．to be changed
B．changed
C．to change
D．changing
单项选择题
It is vital that you () quickly to whatever is said.

A．respond
B．responded
C．will respond
D．are responding
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