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

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Wehaven''theardfromDavid(sinceheleftShanghai).(对括号部分提问)——————haven''tyouheardfromDavid?Wehaven''theardf

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 David (since he left Shanghai).(对括号部分提问) ——— ———haven't you hear
d from David?

We haven't heard from David (since he left Shanghai).(对括号部分提问) ——— ———haven't you heard from David?
How long
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Since when

what time

How long