what (happen)to you before the police arrived
his family (not hear)from him since he went to America
how many awards ( ) juliet()(get)by the end of2008
人气：427 ℃ 时间：2020-06-02 16:50:37
解答
1 had happened ( 动作发生在 arrived 之前
2 haven't heard（ SINCE 与现在完成时连用）
3 had ,got （ 根据by the end of 2008可知
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