1.His sister left home in 1998, and __________ since.
A.had not been heard of B.has not been heard of
2.Edward, you play so well. But I_________ you played the piano.
A.didn't know B. hadn't known C.don't know D.haven't known
3.Everybody was touched __________words after they heard her moving story.
A.beyond B.without C.of D.in
baa是对的,怎么选出来的啊?关于第一题,句中有and,and左边用left,右边应该用过去的一种时态啊,为什么不选A呢?2题也还是不懂,3题懂了,谢谢