MumTomisalwaysworkin的精選

問題詳情：—Mum,Tomisalwaysworkinglateintonight.Idon'tknowwhatheisbusydoing.:狀_元_源Z_—Oh,he_____forhisnewproject.A.hasprepared  B.hadprepared  C.hasbeenpreparing  D.waspreparing【回答】C知識點...