单项选择题

It was not until dark（）it was time to return home.

A. that he realized
B. that did he realize
C. when he realized
D. when did he realize

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单项选择题
He（）the train if he hadn't been stack in traffic jam on the way to the railway station.

A. couldn't miss
B. wouldn't have missed
C. mustn't have missed
D. shouldn't miss
单项选择题
Mr. Yang,（）for his famous invention, was invited to give a lecture in the technical university.

A. was known
B. knowing
C. was knowing
D. known
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