tocleantheclassroomy的精選

問題詳情：—Who       tocleantheclassroomyesterday?  —LiMing.   A.helps   B.helped   C.ishelping   D.willhelp【回答】B。此題考查一般過去時態。根據句意：“誰昨天打掃了教室？李明”前半句...