单项选择题

We are convinced that we are on the _______ of an important discovery.

A．threshold
B．household
C．thread
D．entrance
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单项选择题
The hum of conversation _______ as the chairman mounted the rostrum.
A．died out
B．died off
C．died of
D．died away
单项选择题
She _______ herself bitterly for her behavior that evening.
A．blamed
B．accused
C．reproached
D．scolded
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