Thelinewasbusy;someone________the

发布时间：2020-07-09 15:18:27

The line was busy; someone ________ the telephone.













A.may be using












B.may have used











C.must have been using











D.can be using

网友回答

C
以上问题属网友观点，不代表本站立场，仅供参考！