The baby couldn't stop ____(laugh)while her mothe___(sing)to her.请说明原因!
问题描述：
The baby couldn't stop ____(laugh)while her mothe___(sing)to her.请说明原因!
答
laughing 就是 stop doing 停下来正在做的事情
was singing 这就是 while 引导的时间状语从句,表示正在
句意:妈妈唱歌的时候,小婴儿停止不了大笑