单项选择题

The house ______ will be our new laboratory.

A．building
B．being built
C．to build
D．having built
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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
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
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