单项选择题

The speaker went on and on, ______ to his listeners' obvious boredom.

A．obligated
B．obsessive
C．obvious
D．oblivious
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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
单项选择题
The police inspector, having received new information from a confidential source, decided to enlarge the ______ of his enquiry.
A．scope
B．magnitude
C．dimension
D．volume
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