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
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
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
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