单项选择题

He kept his head, otherwise the accident ______.

A．would happen
B．happened
C．would have happened
D．happens
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单项选择题
He will go to America next month, if he ______ ready then.
A．is
B．will be
C．shall be
D．is going to be
单项选择题
Henry was deported for having an expired visa. He ______ his visa renewed.
A．should have had
B．must have had
C．might have had
D．would have had
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