现在完成时练习题一、单项选择1、Both his parents look sad .Maybe they _whats happened to him .A. knew B. have known C. must know D.will know2、He has _ been to Shanghai , has he ?A. already B.never C.ever D. still3、Have you met Mr Li _?A. just B. ago C.before D. a moment ago4、The famous writer _ one new book in the past two yearA. is writing B.was writing C.wrote D.has written 5、-Our country _ a lot so far .-Yes . I hope it will be even _
