单项选择题

My brother ______ hard and succeeded at last.

A．works

B．worked
C．work
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单项选择题
How long has Mr. Wang been here
A．He arrived here three hours ago.
B．He’s been here for an hour.
C．He came here half an hour ago.
单项选择题
A． B． C．
A．
B．
C．
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