单项选择题

Marketing specialists are really not sure （） changes in the climate will affect sales of recreational vehicles.

A.where
B.how
C.what
D.who

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单项选择题
The managing director demonstrated his faith （） the conscientiousness of the company's employees by allowing them to work flexible schedules.

A.on
B.by
C.in
D.with
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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