单项选择题

Sorry, I don't know he is a friend of ______.

A．your brother
B．your brothers
C．your brother's friend
D．your brother's
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单项选择题
The experiment, ______ will soon be announced, was done by my colleagues.
A．whose results
B．the results on which
C．at which the results
D．of whose results
单项选择题
Good-bye, Miss Liu. I'm very pleased ______.
A．to meet you
B．to have met you
C．meeting you
D．having met you
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