单项选择题

All the class burst _________ laughter when they saw the funny picture.

A．in
B．at
C．on
D．into
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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
单项选择题
I've made _________ more mistakes than you have.
A．a lot
B．many
C．very
D．a lot of
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