单项选择题

I must have ______ for ten minutes before the telephone operator put me through.

A．hung about
B．hung up
C．hung on
D．hung round
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单项选择题
His speech gave us valuable ______ into the problems of education.
A．inquiry
B．investigation
C．input
D．insight
单项选择题
One of the multinationals is expected to make a take-over ______ for the engineering company.
A．bet
B．bid
C．offer
D．pay
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