单项选择题


A．was left
B．leaves
C．had left
D．have left
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单项选择题
A．have been sittingB．had been sittingC．sitD．am sitting
A．have been sitting
B．had been sitting
C．sit
D．am sitting
单项选择题
A．had been workingB．will go to workC．is going to workD．was going to work
A．had been working
B．will go to work
C．is going to work
D．was going to work
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