单项选择题

There is a ______ of three men to one woman in this factory.

A．ratio
B．percentage
C．portion
D．rate
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单项选择题
The novel first ______ in 1920, but did not become well-known until years later.
A．came out
B．printed
C．published
D．came across
单项选择题
It will take months for his fractured leg to ______.
A．heal
B．recover
C．cure
D．recuperate
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