题目内容：

代词it和that的用法

优质解答

it,单数,特指,相当于“the + 单数/不可数名词”；与所指代名词属同一类,而且是同一个.This is my watch; it’s a Swiss one.(《牛津现代高级英汉双解辞典》).Where is my book?Have you seen it?(同上)以上两句中的i...