Tom often surfs on the internet,no(C)he fell far behind the others in his class.A.doubt B.idea C.wonder D.problemno wonder 难怪...的意思汤姆经常上网,难怪他的成绩落后于班上其他同学.如还有疑问,欢迎可以...为什么不选AThere is no doubt that.... 这么用才可以毫无疑问的......