used to do，be used to doing的区别

　　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