单项选择题

There have been quite a number of road ______today because of yesterday's snowstorm.

A．incidents
B．accidents
C．accident
D．incident
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单项选择题
His health______, my father retired from the business last year.
A．fails
B．was failed
C．failing
D．failed
单项选择题
He explained everything over and over again ______anyone should misunderstand him.
A．since
B．when
C．lest
D．as if
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