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

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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）
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• 求选B还是C?I haven't heard from him______,so I miss him very much.A.clearly B.recent C.recently D.really 我估计应该是C吧,应该用副词,