单项选择题

He owes his great success hard work and opportunity.

A．in
B．on
C．to
D．for
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单项选择题
John has just left New York, but I did not know he until yesterday.
A．will leave
B．had been leaving
C．leaves
D．was leaving
单项选择题
by Columbus, all the arguments came to an end.
A．Tile new land was discovered
B．Was the new land discovering
C．With the new land discovered
D．With the new land discovering
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