单项选择题

Our sports meeting has been ______ because of the heavy rain.

A．protested
B．kept
C．prevented
D．postponed
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单项选择题
In. our hospital, there are altogether 120 ______.
A．woman doctors
B．womans doctors
C．women doctors
D．women's doctors
单项选择题
Seventy-five percent of the surface of the earth （） by water.

A．are covered
B．is covered
C．have been covered
D．was covered
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