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
The name of the film was just ______ of my tongue.
A. on the edge
B.on the point
C. on the top
D. on the tip
单项选择题
The classroom needs______.
A. clean
B. to clean
C. to be cleaned
D. being cleaned
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