单项选择题

They waved their hands and hats at last ______ to their friends and native land.

A．congratulation
B．look
C．farewell
D．leave
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单项选择题
—Are you sure ______ you've met him before
A．unless
B．that
C．when
D．though
单项选择题
The girl is often listened ______ songs at the next room.
A．practise to sing
B．practise singing
C．to practise to sing
D．to practise singing
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