good for our environment to plant more trees．( )A．ItB．It'sC．That's 题目和参考答案——青夏教育精英家教网——

题目内容

18．________ good for our environment to plant more trees．（　　）

A．

It

B．

It's

C．

That's

分析多植树对于我们的环境来说是有益的．

解答答案：B．it的意思是"它"经常用于一些结构当中作形式主语，比如：It is+形容词 for sb．/sth．to do sth．这是一个固定结构，用it作形式主语，真正的主语是后面的不定式短语．that意思是"那个"指示代词，指的是距离比较远的事物或人．根据"good for our environment to plant more trees．"正好符合结构"It is+形容词 for sb．/sth．to do sth．"所以要用it's来填空，故选B．

点评首先要掌握it的一些常见的用法，然后结合具体的题目，就可以确定正确答案．

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