单项选择题

His ______ will be invaluable to understanding technological challenges the BBC is facing.

A．fantasies
B．expertise
C．ideology
D．humanities
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单项选择题
The tragedy could have been ______ if the crew had followed safety procedures,
A．interfered
B．averted
C．intervened
D．distracted
单项选择题
Two suspects have been ______ by the police for questioning.
A．retained
B．detained
C．repelled
D．excelled
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