单项选择题

While watching TV, ______.

A. the telephone rang

B. the telephone was ringing
C. the telephone was heard ring
D. I heard the phone ringing
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单项选择题
You______him so closely; you should have kept your distance.
A. shouldn’t follow

B. mustn’t follow
C. couldn’t have been following
D. shouldn’t have been following
单项选择题
The house built of stone lasts longer than______built of wood.
A. the one
B. one
C. that
D. its
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