单项选择题

They ______ TV for two hours.

A．had watched
B．are watching
C．watched
D．have been watching
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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
单项选择题
A large ______ of money is spent on tobacco every year.
A．account
B．amount
C．number
D．quality
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