问题
选择题
When he was a little boy，he ______ on the farm.
A．used to working
B．used to work
C．got used to work
D．was used to work
答案
B
used to do sth.意为"过去经常做某事"。be used to do sth.意为"被用来做某事"。be/get used to doing sth."习惯于做某事"。
。第一磨牙近中关系，上下牙列Ⅲ度拥挤，
反
颊向。