单项选择题

The old man________ traveling by air, for he had a serious heart disease.

A．didn't use to
B．hasn't used to
C．hadn't used to
D．wasn't used to
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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
Mary's editor wanted her to ________the poetry from her novel.
A．cut down
B．cut in
C．cut off
D．cut out
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