问题补充:
Within a few years China well have the most advanced railway industry in the world.
A. will
B. can
C. must
D. may
答案:
A. will
B. can
C. must
(答案→)D. may
解析:句意:在几年中,中国很有可能有世界上最先进的铁路行业。和well搭配用may,may well主要用于加强推测的语气,表示具有较大的可能性。其他三个情态动词不能和well搭配,所以选D。