单项选择题

Yesterday when I left, they ______a meeting.

A．had
B．are having
C．were having
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单项选择题
We reached the station ______ the train had left.
A．before
B．until
C．after
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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