单项选择题

Before villages began people ______.

A．hunted for food
B．stayed in one place
C．lived together
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单项选择题
People didn't have to .move from one place to another after ______.
A．machines came along
B．factories were built
C．they learned to hunt animals
单项选择题
Mrs. Green didn't know both shoes were for the right foot until ______ one day.
A．she came back from dinner
B．she wanted to wear them
C．she called the shoemaker
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