以前在高一课本看到的一句话:That's changed since I was here.网上说这句有歧义,分两种情况:1. That's changed since I was here last time.2.That's changed since I was here and I didn't see.老师们可以帮忙分析下吗?感谢!
With so many companies competing for consumers' attention, price competition was intense and profit margins thin or nonexistent.profit margins 后面是否省略了were?