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She was very worried because her parents ()(not reply)to her

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She was very worried because her parents ()(not reply)to her last three e-mails yet 动词填空
填hadn't replied
过去完成时,其中一种用法是:过去某动作一直持续到现在将来可能还要延续下去.句中的动作发生在过去之前(过去的过去),即过去完成时动作发生在过去的过去.
过去没回信,持续到现在,还可能继续持续下去,且reply这个动作发生在was...worried之前,过去的过去
希望我的回答你有帮助
再问: I like old things。This is the second time I ()(see)the exhibition at the museum 动词填空。
再答: have seen