单项选择题

People ____________that vertical flight transports would catty millions of passengers as do the airliners of today.

A． convinced
B． anticipated
C． resolved
D． assured
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单项选择题
We should always keep in mind that ____________decisions often lead to bitter regrets.
A． urgent
B． hasty
C． instant
D． prompt
单项选择题
The professor can hardly find sufficient grounds ________________ his argument in favor of the new theory.
A． which to base on
B． on which to base
C． to base on which
D．which to be based on
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