— you go to work by car? —Yes. But now I take the bus to work.A. Are, used to B. Did, us

— you go to work by car? —Yes. But now I take the bus to work.
A. Are, used to
B. Did, use to
C. Do, use to
D. Were, used to

A. Are, used to (答案→)B. Did, use to C. Do, use to D. Were, used to解析：used to的用法比较固定，需要注意的是used to do表示过去常常做某事，be used to表示习惯于某事。前者to是不定式符号，后接动词原形。后者to是介词，后接名词或者名词性短语。Used to do结构中use相当于行为动词，有词形变化。Be used to中used相当于形容词，无词形变化。根据下文，是的，但是现在我乘公交车去上班。可知前文指的是，你过去常常开车去上班吗？故选B。

我明天再问问老师，叫他解释下这个问题