单项选择题

While watching television, ______.

A．the telephone rang
B．we heard the telephone ring
C．and to play football
D．the telephone was rung

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单项选择题

All the references she has obtained for her doctoral dissertation ______ about twenty items.

A．make up for
B．add up to
C．come up with
D．put up with

单项选择题

With prices ______ so much, it is impossible for the company manager to stick to the original budget.

A．waving
B．swinging
C．fluctuating
D．vibrating

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