单项选择题

He welcomed the new students and then ______ the college regulation.

A．goes on to explain
B．went on to explain
C．went on explaining
D．went on with explaining
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A large ______ of money is spent on tobacco every year.
A．account
B．amount
C．number
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单项选择题
My father likes sports ______ my mother is interested in music.
A．when
B．as
C．while
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