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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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
单项选择题
Our department has a large collection of books,（）are in English.

A．many of which
B．many of them
C．many ones
D．their many
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