问题补充:
We six days a week, but now we only work five days.
A. used work
B. are used to work
C. used to working
D. used to work
答案:
A. used work
B. are used to work
C. used to working
(答案→)D. used to work
解析:句意:我们过去常常一周工作六天,但是我们现在只工作五天了。Used to do sth过去常常做某事。To是不定式符号,后面接动词原形。be used to sth习惯于某事,故选D。