单项选择题

Only one horse can go through the door ().

A．at once time
B．at a time
C．in once time
D．in no time

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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
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
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