He usually goes to work by bike,but he ___ goes to work on foot.

问题描述:

He usually goes to work by bike,but he ___ goes to work on foot.
A.often B.never C.always D.sometimes

D
前一句说 他通常是骑车去上班
后句用了but,转折
但有时他也步行去上班.
有时,sometimes
A常常 B从不  C一直,三者意思都不符