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
（）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
单项选择题
Television is another major instrument of communication,（）us to see as well as to hear the performer.

A．permitted
B．to permit
C．permitting
D．being permitting
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