had fled away
分析一下句子翻译：猫出现之前,老鼠都逃光了.
显然逃发生在猫出现之前.
那么appeared用过去时,所填应该比过去还早,就是我们所说的过去的过去.
就是过去完成时,还要注意flee的过去时是fled.就解出来了.
类比U9的标题句（好像是u9,记不太清）：The bus had left before I got to the bus station.
The mice ____(flee) away before the cat appeared.填什么
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