单项选择题

All ________knowledge originates in direct experience.

A．generous
B．genuine
C．genius
D．gentle
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单项选择题
Those physicians and specialists ________in their fight against heart disease.
A．broke down
B．broke off
C．broke out
D．broke through
单项选择题
He________ that the police would never allow this sort of thing.
A．should have known
B．would have known
C．could have known
D．might have known
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