单项选择题


A．running
B．runs
C．is running
D．was running
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单项选择题
A．There wasB．There isC．It'sD．It was
A．There was
B．There is
C．It's
D．It was
单项选择题
A．didn't meetB．haven't metC．didn't knowD．haven' t known
A．didn't meet
B．haven't met
C．didn't know
D．haven' t known
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