单项选择题

"Why is the university doing so much building"
"The number of students ______ that there aren't enough classrooms."

A．have increased so rapidly
B．has increased so rapid
C．have increased so rapid
D．has increased so rapidly
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单项选择题
There was ______ of complete silence.
A．an instant
B．hours
C．three minutes
D．seconds
单项选择题
Students today are writing ______ of poetry.
A．a great many lines
B．quantities of lives
C．lots lines
D．a large number
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