问题
选择题
When I was a student, I ______ to school ______ the bus
A．used to going , by
B．used to go , on
C．used to go, by
D．was used to go, on
答案
答案：B
题目分析：句意：当我上中学时，我常常做公交车去上学。Used to do sth意为“过去常常做某事，现在已经不做了”；on the bus意为“在公交车上，通过公交车”，用介词短语by bus时，中间不用冠词；故选B。