单项选择题

Don't you know he is an old friend of ______

A．my brother
B．my brothers
C．my brother's
D．my brother's friend
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单项选择题
The investigation, ______ will soon be published, was made by John.
A．at which the results
B．the results on which
C．whose results
D．at whose results
单项选择题
Good-bye, Mr. Wang. I'm pleased ______ you.
A．to meet
B．meeting
C．to have been meeting
D．to be met
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