单项选择题

I'll ask Mr. Smith to ring you up ______ he comes back to the office.

A．when
B．where
C．because
D．although
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单项选择题
When they need overalls for their job, employees should inform the Supplies Department of （）

A．the size
B．the color
C．the style
D．the quantity
单项选择题
If employees work on public holidays, usually they will get （）

A．extra days off
B．extra money
C．a pay raise
D．paid holidays
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