单项选择题

It was not until it got dark ______ working.

A．that they stopped
B．when they stopped
C．did they stop
D．that they didn't stop
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单项选择题
History is a record of mankind; different historians, ______ , interpret it differently.
A．therefore
B．on the contrary
C．however
D．consequently
单项选择题
It is time to ______ fields in which they are just as capable as men.
A．keep women's
B．stop to keep women out
C．keep women away
D．stop keeping women out Of
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