单项选择题

Mrs. White became a teacher in 1985. She ______ for twenty years by next summer.

A．will teach
B．will have taught
C．has been teaching
D．will have been taught
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单项选择题
No wonder you caught a cold. You ______ out last night without a coat.
A．shouldn't have gone
B．mustn't have gone
C．couldn't have gone
D．mightn't have gone
单项选择题
I found the washing machine I had had ______ broke down again.
A．it repairing
B．repaired
C．it repaired
D．to be repaired
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