单项选择题

Great changes () in our country since twenty years ago.

A．have taken place
B．have been taken place
C．took place
D．have been happened

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单项选择题
Tom's parents will be back from London ().

A．long before
B．before long
C．before soon
D．soon after
单项选择题
The car runs () 80 kilometres an hour,

A．at
B．in
C．with
D．on
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