单项选择题

Last night he was ____________ by a tricycle and had to be taken to hospital.

A．fallen down
B．knocked out
C．run over
D．tripped up
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单项选择题
It's quite ____________ me why she married such a heavy smoker.
A．between
B．beyond
C．beneath
D．before
单项选择题
It pays ____________ to buy goods of high quality.
A．at the end
B．in conclusion
C．at length
D．in the long run
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