单项选择题

As a public relations officer, you should know your customers ______ detail.

A．in
B．on
C．for
D．to
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单项选择题
Since the new technology was introduced last month, we ______ in speeding up production.
A．succeed
B．succeeded
C．have succeeded
D．will succeed
单项选择题
In order to improve your communication skills, we will show you how to learn ______ about your customers than you know now.
A．many
B．much
C．most
D．more
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