单项选择题

Our new range of products is available in ______ configurations, including sports and commercial styles.

A. vary
B. variety
C. variable
D. various
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单项选择题
The chief executive officer is particularly （）that recent staff surveys have shown a severe drop-off in employee satisfaction.

A. concern
B. concerns
C. concerning
D. concerned
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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