单项选择题

So far there is no proof()people from other planets do exist.

A．which
B．that
C．what
D．how

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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
When I visited your country again last year I found it completely().

A．to be changed
B．changed
C．to change
D．changing
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