单项选择题

Jim, the newly elected director, had to reorganize the entire office; he angrily complained of his ______, who had been so incompetent that everything was left in a mess.

A．successor
B．ancestor
C．predecessor
D．forefather
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单项选择题
When a machine analyses the frequencies used by a particular voice and draws a graph of them, sound is ______ electronically into a pattern of lines.
A．relieved
B．converted
C．magnified
D．burst
单项选择题
Because Bob had stopped reading his technical journals he was ______ of new development in his field.
A．intellectual
B．subtle
C．ignorant
D．tedious
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