单项选择题

I bought a new house last year, but I ______ my old house yet, so at the moment I have two houses.

A．did not sell
B．have not sold
C．had not sold
D．do not sell
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单项选择题
They required that all the necessary documents ______ to the president's office before the end of this month.
A．be handed
B．must be handed
C．should hand in
D．had been handed in
单项选择题
The traffic was very heavy~ otherwise I ______ here 50 minutes sooner.
A．would be
B．should be
C．would have been
D．had been
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