单项选择题

A．had been working
B．have been working
C．worked
D．have worked
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单项选择题
A．was leftB．leavesC．had leftD．have left
A．was left
B．leaves
C．had left
D．have left
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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