单项选择题

The research institute has recruited 25 university graduates ______ in science.

A．majored
B．majoring
C．having majored
D．have majored
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单项选择题
It seems that he never knows how to speak in a ______ way.
A．respectful
B．respectable
C．respective
D．respected
单项选择题
Sometimes the 3-year-old child has trouble ______ fact from fiction.
A．separating
B．to separate
C．having separated
D．for separating
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