单项选择题

Those who let uncertainty ______ rarely achieve much.

A．turn them down
B．send them down
C．weigh them down
D．take them down
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单项选择题
The ______ of the undertaking did not discourage the researchers.
A．intolerance
B．futility
C．proximity
D．reminiscence
单项选择题
Mary could invite her friends to the house at her own ______ if she told her mother in time.
A．prudence
B．discretion
C．reaction
D．exertion
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