单项选择题

Mary is never late for class, _____

A．doesn’t she
B．isn’t she
C．does she
D．is she
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单项选择题
When she turned the corner, she found herself _____ by a man with dark glasses.
A．was followed
B．followed
C．had been followed
D．was following
单项选择题
According to the schedule, the plane for Sydney _____ at eight o’clock in the evening.
A．takes off
B．is taking off
C．has taken off
D．was taking off
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