单项选择题

I am sorry ______ you so much trouble. And thank you for your help.

A．to give
B．giving
C．to have given
D．gave
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单项选择题
______send your motorcycle to be repaired You'd better not drive it any more.
A．Why
B．Why not
C．Why don't
D．Why didn't
单项选择题
The famous basketball star,______tried to make a comeback, attracted a lot of attention.
A．where
B．when
C．which
D．who
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