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
My brother ______ hard and succeeded at last.
A. works

B. worked

C. work
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
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