单项选择题
I ______ to work by bus but now I go to work on foot.
A．used to going
B．used to go
C．am used to going
D．am used to go
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单项选择题
Don' t smoke until the plane ______ off.
A．takes
B．took
C．has taken
D．had taken
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单项选择题
She didn't know ______.
A．where she gets the book
B．where would she get the book
C．where getting the book
D．where to get the book
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