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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
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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