单项选择题

To celebrate our tenth year in the stationery supply business, we'd like to offer a special bonus discount （） our most loyal customers.

A.to
B.by
C.as
D.at

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单项选择题

（） recent adjustments in income tax rates, workers will find themselves pleasantly surprised by an increase in the size of their paychecks.

A.Due to
B.While
C.In fact
D.Whether

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