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
Shirley _____a book about China last year but I don’t know whether she has finished it.
A．has written　
B．wrote　
C．had written　
D．was writing
单项选择题
Dr. Bethune began to work the _____ he arrived at the front.
A．moment
B．place
C．way
D．reason
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