单项选择题

We reached the station ______ the train had left.

A．before
B．until
C．after
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单项选择题
Eight ______ are eating grass at the foot of the hill.
A．horse
B．sheep
C．sheeps
单项选择题
The old lady (夫人,女士) is in her ______.
A．seventieth
B．seventy
C．seventies
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