单项选择题

______ is often the case, one third of the workers have over-fulfilled the production plan.

A．What
B．This
C．That
D．As
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单项选择题
Mary has got a full mark in the test. She ______ very hard all these days.
A．will work
B．may work
C．must have worked
D．could have worked
单项选择题
A．In a passport office.B．At an airport.C．In a police station.D．Outside a ticket office.
A．In a passport office.
B．At an airport.
C．In a police station.
D．Outside a ticket office.
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