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
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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