单项选择题

John and Sue______ computer games for hours before their parents came home from work.

A．are playing
B．have been playing
C．played
D．had been playing
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- Do you mind if I smoke - Well, actually,______.
A．I'd rather you didn't
B．go ahead
C．it doesn't work
D．never mind
单项选择题
It is said that Sally's been painting for years since she was a little girl,______
A．isn't she
B．hasn't it
C．hasn't she
D．doesn't it
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