单项选择题

After four years' hard study in Harvard, he has got a ______ knowledge of medicine.

A．potential
B．comprehensive
C．respective
D．exclusive
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单项选择题
Our ______ new machines are much more economical to run, compared to the old ones.
A．effective
B．efficient
C．affective
D．affectionate
单项选择题
There seems no need to inform him, for he is ______ to know the answer.
A．feasible
B．possible
C．likely
D．probable
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