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单项选择题

Three years ______ a short time. You have to study hard.

A．is
B．are
C．be

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热门试题

单项选择题Please ______ before you cross the road.

A．look up
B．look around
C．look at

单项选择题He walked so ______ that he missed the last bus.

A．fast
B．slowly
C．quickly