单项选择题

A． You’re right.
B． But it’s still early.
C． What do you think of it
D． Why are you so late
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单项选择题
A． He smoked before now.B． He likes smoking.C． He never smokes.D． He is starting to smoke.
A． He smoked before now.
B． He likes smoking.
C． He never smokes.
D． He is starting to smoke.
填空题
The professor, as well as his assistants, (do) _______the experiment in the lab forty hours a week.
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