______ a lot of books,the boy knows much more than the boys of his age.
问题描述：
______ a lot of books,the boy knows much more than the boys of his age.
A.not having heard
B.having not heard
C.not hearing
D.not to have heard
选择打错了
A.Reading
B.having read
C.read
D.to have read
答
B.having read 现在分词完成时做原因状语,是肯定意义,其他的是否定形式,错误