MumTomisalwaysworkin的精选

问题详情：—Mum,Tomisalwaysworkinglateintonight.Idon'tknowwhatheisbusydoing.:状_元_源Z_—Oh,he_____forhisnewproject.A.hasprepared  B.hadprepared  C.hasbeenpreparing  D.waspreparing【回答】C知识点...