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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• We have't heard from David since he left Shanghai.(对划线部分提问,划since he left Shanghai）
• We haven't heard from David since he left Shanghai.[对划线部分提问] since he left Shanghai[画线]
• We have't heard from David since he left Shanghai.(对划线部分提问,划since he left Shanghai）
• 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
• i haven't heard from him recently.这里 from him是表语吗.
• Tom____carefully but ___nothing A.listened;listned B.beard;heard C.listened; heard D.heard;listened说明理由有高分