单项选择题

__________ at in this way, the present economic situation doesn't seem so gloomy.

A．Looking
B．Looked
C．Having looked
D．To look
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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
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
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