单项选择题

The article ______ on this subject was written by Mr. Black.

A．referred
B．referring to
C．referred to
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单项选择题
I ______ my English book in the reading-room. Please go and get it for me.
A．forgot
B．lost

C．left
单项选择题
My brother ______ hard and succeeded at last.
A．works

B．worked
C．work
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