单项选择题

As stock prices plunged during the banking crisis, some investors were beginning to lose hope.

A．tumbled
B．dispersed
C．collapsed
D．dripped
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单项选择题
The arrangement of the meeting has to be kept confidential for the sake of security.
A．confident
B．secret
C．flexible
D．positive
单项选择题
Companies can maintain good business relations by abiding by their promises and agreements.
A．coming up with
B．breaking away from
C．living up to
D．getting rid of
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