单项选择题

Your comments ______ my work have proved to be helpful.

A．in
B．for
C．on
D．against
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单项选择题
Do you think there would be less conflict in the world if all people ______ the same language
A．spoke
B．speak
C．had spoken
D．will speak
单项选择题
He said he was quite satisfied ______ my progress.
A．with
B．to
C．on
D．at
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