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...I like old things。This is the second time I （）（see）the exhibition at the museum 动词填空。have seen