used to do sth.过去常常做某事。
否定：didn't used to，或者usedn't to
be used to do sth.被用来做某事
be used to doing sth.习惯于做某事
例题：
Jack used to ___ to school by bus,
but now He is used to ___ There.
A.go walk. B.going ，walk
C.go，walking. D.going，walking
答案C
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