单项选择题

People invest money in this company（）they believe it will make profits.

A．though
B．because
C．unless
D．until

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

A．in
B．on
C．for
D．to
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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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