单项选择题
______ you choose to contact us, you can expect our efficient and helpful service.
A.No sooner than
B.Ever since
C.No matter how
D.Even though
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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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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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