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
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
单项选择题
But for your help, I ______ my work yesterday.
A．can't finish
B．wasn't able to finish
C．couldn't finish
D．couldn't have finished
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