单项选择题

Eight ______ are eating grass at the foot of the hill.

A. horse
B. sheep
C. sheeps
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单项选择题
My mother was busy ______ when I rang back home.
A. cook
B. to cook
C. cooking
单项选择题
His grandfather ______ for ten years.
A. died
B. has died
C. has been dead
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