选择His sister left home in 1998,and ____since.A has not been heard of B has not heard of

选择His sister left home in 1998,and ____since.A has not been heard of B has not heard of His sister went ____ once his mother left home.（用介词或副词） His sister is tall .(short)(改为选择问句） He left his sister alone at home.和He left his sister at home alone.有何区别?都对?还是就一个对 his sister His sister,always is his sister. his sister didn't know the timebecause she _________her watch at home .a.leave b.left c.forght d.forgot His sister left home in 1998,and has not been heard of since.请问：AND后为什么不用“had”? 翻译Not until most of the people had left the airport did he see his sister was there. 什么his sister his sister is That's () sister's book(he/his)选择哪个词填空he/his和sister哪个是主语怎么分清要填写第几人称 ___ which way to take ,the little boy behaved like a real gentleman ,comforting his sister from time to time.A.Leaving to wonderB.Having left to wonderC.Left wonderingD.Left to wonder ___ which way to take ,the little boy behaved like a real gentleman , comforting his sister from time to time.A.Leaving to wonderB.Having left to wonderC.Left wonderingD.Left to wonder答案是C 怎么解释?! 英语初一试题His father with his sister ( ) Beihai选择A.lives B.live in C.live D.lived inhe with his parents ( ) in Japan 填空 英语语法的一个简单问题his sister left home in 1998,and has not been heard of since.为什么要加been?不加不行么? 帮忙分析下面两个歧义句John and Mary went to New York last week.John left his sister to paint in Paris. His sister left home in 1998,and ＿ since.A.had not been heard of B.has not been heard of C.ha