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
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单项选择题
Mary's editor wanted her to ________the poetry from her novel.
A．cut down
B．cut in
C．cut off
D．cut out
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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