We have't heard from David since he left Shanghai.(对划线部分提问,划since he left Shanghai）

We have't heard from David since he left Shanghai.(对划线部分提问,划since he left Shanghai） not,time,Tom,we,for,from,a,heard,long,have what we have seen from what we have heard 怎么分析 I()for six month A,have receievd Jonh's letterB,have heard from JONHc,haven't heard from JONH. We have heard no news from him but we‘re still ( )(hope)请问一个英语题! 英语21.I wonder why Jenny _______ us recently.We should have heard from her by now.21.I wonder why Jenny _______ us recently.We should have heard from her by now.A.hasn’t written B.doesn’t write C.won’t write D.hadn’t written为什么? 一个英文句子 what we have seen from what have heard Have you heard from ___recently? how long have't you heard from him是 heard from 还是 heard of 还是 hear from & hear of?为什么不是 heard from前面是have 的完成时啊 3.-Have you heard from him yet?A.I don't mind B.Yes,I have I wonder why Jenny ________ us recently.We should have heard from her by now.A.hasn't written B.doesn't write C.won't write D.hadn't written i wonder why jenny ( ) usrecently.we should have heard from her by now 下列各句有一处错误,请找出来并且改正1.We haven't heard letters from her for ages.How we miss her?2.Have you cleaned the classroom this afternoon?3.Last Monday Daming didn't feel good,he didn't come to school.4.-Have you ever heard Liu We haven't heard from David (since he left Shanghai).(对括号部分提问) ——— ———haven't you heard from David? we haven't heard from them since last month.为什么这里不能用until啊? I wonder why Jenny hasn't written us recently.We should have heard from her by now.为什么这里不用hasn't written to us?write to sb.短语的to 可以省略? i have heard that we can't eat these day 为何填chicken I havet heard from Millie yet(改为肯定句)I —— ——from MIllie——