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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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
单项选择题
College students can easily ______ from one curriculum to another, from one institution to another, as suited to their needs.
A．move
B．transfer
C．transmute
D．travel
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