4.Shanghai has taken on a new look.It isn’t like _____ it used to be .

Shanghai has taken on a new look.It isn’t like (what) it used to be .what引导名词性从句,表示“所……的” "what it used to be"也是个常见的词组,表示“它过去的样子”,最好记下.整句：上海已经呈现出新的面...