单项选择题

There has been a ______ increase of complaint about the matter because of misunderstanding.

A．regretting
B．regretted
C．regretful
D．regrettable
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单项选择题
I think that you should take a(n) ______ language course to improve your English.
A．mid
B．middle
C．medium
D．inter, mediate
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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