单项选择题

A．discovered
B．acted
C．designed
D．invented
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单项选择题
A．concernedB．itselfC．availableD．oneself
A．concerned
B．itself
C．available
D．oneself
单项选择题
A．The train is faster than the bus.B．There are two buses every day.C．The bus is cheaper than the train.D．The train is cheaper than the bus.
A．The train is faster than the bus.
B．There are two buses every day.
C．The bus is cheaper than the train.
D．The train is cheaper than the bus.
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