Heissodetermined!He________onthep

发布时间：2020-07-26 17:49:50

He is so determined!He ________ on the problem for two hours, and he will go on with it until he works it out．A.worksB.workedC.is workingD.has been working

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！