单项选择题

It is imperative that the students ______ to hand in their papers on time.

A．told
B．be told
C．are told
D．have been told
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单项选择题
The plan for unity under a federal system ______ into effect in 1782.
A．put
B．got
C．went
D．set
单项选择题
There are fast buses, double-decker buses, air-conditioned or heated buses, ______ a good service.
A．all to offer
B．all are offering
C．all offering
D．all offered
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