单项选择题

We will have to cancel the conference______ more people sign up to attend.

A．if
B．either
C．unless
D．because
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The state of Washington receives more rain each year ______ any other geographical region in North America.
A．for
B．than
C．as
D．by
单项选择题
Gerber Investments ______ ranks among the top finance companies in the region according to customer surveys.
A．briefly
B．lightly
C．enormously
D．consistently
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