A set of ( ) is lost

问题描述:

A set of ( ) is lost

RT 问题补充:这是1个连句` keys a set of一串 lost丢失的 keys lost

这里可以用很多东西
例如A set of cards, memory(指电脑记忆卡或者记忆) 等

keys
一串钥匙丢失了.