单项选择题

The number of students in this college _________ this year.

A．have doubled
B．has doubled
C．have been doubled
D．has been doubled
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单项选择题
Weather _________, we'll have an outing tomorrow.
A．permits
B．permitted
C．permitting
D．permit
单项选择题
After I _________ for half an hour, I realized that he was not coming.
A．have waited
B．waited
C．had been waiting
D．was waiting
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