单项选择题

Three years have ______ since we last met at the conference for Internet communication in Beijing.

A．elapsed
B．discerned
C．discontented
D．electrified
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单项选择题
He had a clear ______ of what was wrong with the machine and fixed it in a short time.
A．debris
B．deficiency
C．perception
D．persecution
单项选择题
He is often inclined to ______ in other people's affairs, which is none of his business.
A．manipulated
B．lumbered
C．meddle
D．littered
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