单项选择题

It was not until the accident happened ______.

A．when I realized my carelessness
B．as I realized my carelessness
C．that I realized my carelessness
D．when my carelessness has been realized
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单项选择题
He checked his car carefully lest it ______ on the way.
A．breaks down
B．would break down
C．should break down
D．broke down
单项选择题
Two new bridges ______ on the river by the end of next year.
A．will be built
B．will have been built
C．are going to be built
D．have been built
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