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
A suitable title for this passage might be ______.
A．Wild Animals
B．Animal Kingdom
C．Moss Growth
D．The Lazy Animal
单项选择题
21（）

A．lives
B．stays
C．sleeps
D．plays
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