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
All staff members are reminded that you should not use the executive restroom ______ you have written authorization to do so.
A. for
B. unless
C. without
D. although
单项选择题
______ it prove necessary to send your payment by money order, please take your request to the Payments Department, where you will find the appropriate forms.
A. Could
B. Would
C. Should
D. Might
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