单项选择题

By the end of this year Mr. Smith ________in our company for exactly three years.

A．is working
B．has worked
C．will work
D．will have worked
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单项选择题
This passage is probably taken from（）

A．an advertisement of an airline
B．a notice for airline passengers
C．a schedule of an international flight
D．an introduction to an airline company
单项选择题
What will passengers have to do if their baggage is over the free allowance（）

A．To pay extra money.
B．To carry it themselves.
C．To ask for special permit.
D．To drop the excessive item.
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