—You're late again.—Yes.Icouldn't find my key to the car when ___ home.为什么不填left填leaving
问题描述：
—You're late again.—Yes.Icouldn't find my key to the car when ___ home.为什么不填left填leaving
答
这是一个省略句,把省略内容给补充出来你就懂了.
I couldn't find my key to the car when （I was）leavinghome. 填left就是被动离开,显然不成立.
省略句省略的就是 代词+be动词,一定要一起省略!希望对你有帮助.码字不易,忘采纳