关于used to be
问题描述：
关于used to be
the traffic in our city is more convenient than it used to be
还是应该这样 the traffic in our city is more convenient than that it used to be
答
应该是：the traffic in our city is more convenient than that it used to be
因为比较的是the traffic(situation) in our city,不能将被比较的对象省略