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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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
单项选择题
Turn on TV, and you ______ many advertisements every day.
A．see
B．will see
C．would see
D．saw
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