单项选择题

A．When they are on holidays.
B．On Sunday mornings.
C．On Saturday night.
D．As soon as they have information.
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单项选择题
A．He has ever visited no more than two cities.B．He has made only a few business trips.C．He has never been to Shenzhen and Beijing.D．He has been to ninny small cities.
A．He has ever visited no more than two cities.
B．He has made only a few business trips.
C．He has never been to Shenzhen and Beijing.
D．He has been to ninny small cities.
单项选择题
A．California dental schools.B．A little-known fact about George Washington.C．Uses of animals in research.D．George Washington’s sleep habits.
A．California dental schools.
B．A little-known fact about George Washington.
C．Uses of animals in research.
D．George Washington’s sleep habits.
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