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
The old lady (夫人,女士) is in her ______.
A．seventieth
B．seventy
C．seventies
单项选择题
Mother was busy ______ when you rang up.
A．to cook
B．cook
C．cooking
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