Mary often studies English by with a group.A. workingB. workC. to workD. worked

发布时间：2020-08-21 01:49:34

Mary often studies English by      with a group.
A. working
B. work
C. to work
D. worked

网友回答

(答案→)A. working
B. work
C. to work
D. worked
解析：因为by为介词，后接动词ing 形式，故选A
以上问题属网友观点，不代表本站立场，仅供参考！