单项选择题

We would like to remind our clients that, should they have any problems （） our products, our after-sales hotline service is available 24 hours a day.

A.to
B.at
C.for
D.with

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单项选择题

If you wish to take advantage of our special gift offers, please （） your sales receipts to one of our employees at the promotions counter on the third floor.

A.guard
B.record
C.consider
D.present

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