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
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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
单项选择题
Many of the electric goods which are advertised as ______ the modem woman tend to have the opposite effect.
A．liberate
B．to liberate
C．liberating
D．liberated
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