Bynow,they________formorethan3hou

发布时间：2020-07-26 01:01:59

By now, they ________for more than 3 hours.A.had exercisedB.are exercisingC.will have exercisedD.have exercised

网友回答

D
以上问题属网友观点，不代表本站立场，仅供参考！