Question

【题目】Lily found that she (lose) her key when she got home.

Answer 1

【答案】had lost
【解析】 时间状语从句 when she got home 的动作发生在过去，“她的钥匙丢了”这一动作应该是发生在“她到家”之前，表示过去的过去，用过去完成时，故填 had lost。