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We haven't heard from David (since he left Shanghai).(对括号部分提

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We haven't heard from David (since he left Shanghai).(对括号部分提问) ——— ———haven't you hear
d from David?
How long
矢志提高答题准确率,一起努力吧^_^
再问： 请问为设么是这个答案？
再答： 提问的是多长时间没写信了。 祝学习进步哦，矢志提高答题准确率，一起努力吧^_^
再问： 这句话不是说“我们没听见David的消息，自从他离开上海。”吗？O(∩_∩)O谢谢
再答： hear from收到。。。的来信
We haven't heard from David (since he left Shanghai).(对括号部分提 We haven't heard from David since he left Shanghai.[对划线部分提问] We have't heard from David since he left Shanghai.(对划线部分提问,划 I haven’t heard from him（ ）he left home.A、when B、since C、as 英语he left home two weeks ago and we haven't heard from him__ He left home two weeks ago and we haven't heard from him__ He said"I haven't heard from him since May". I haven't heard from George (since the end of last year).(括号 we haven't heard from them since last month.为什么这里不能用until啊? i haven't heard from my sister since last year I haven’t heard from her since she went abroad. I haven't heard from him( )he went abroad