单项选择题

Firms that use computers have found that the number of staff __________ is needed for quality control can be substantially reduced.

A．whose
B．as
C．what
D．that
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单项选择题
All of us would have enjoyed the party much more if there __________ quite such a crowd of people there.
A．weren't
B．hasn't been
C．hadn't been
D．wouldn't be
单项选择题
I was very much put __________ by Mark's rude behavior; it really annoyed me.
A．over
B．off
C．up
D．by
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