单项选择题

It was not until the accident happened ______.

A．that I realized my carelessness
B．when I realized my carelessness
C．as I realized my carelessness
D．when my carelessness has been realized
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单项选择题
Yesterday when I was walking on the street, I ______ to see an old friend of mine.
A．managed
B．happened
C．settled
D．occurred
单项选择题
This invention is so great. ______.
A．So is it
B．So it is
C．Nor is mine
D．Nor is it
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