单项选择题

Any employee wishing to leave the workplace for any reason during business hours must （） a special leave form.

A.sign
B.signs
C.to sign
D.was signed

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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
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
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