单项选择题

The frequent（）from cold to warm weather this spring have caused much illness.

A. transmissions
B. transactions
C. transformations
D. transitions

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单项选择题
While watching television, （）

A．the telephone rang
B．we heard the telephone ring
C．we heard the telephone rang
D．the telephone was rung
单项选择题
He used to play badminton with you, （）?

A．didn't he
B．used he
C．did he
D．hadn't he
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