Question

17．______ worries me that my daughter plays with her cellphone for a long time every day．（　　）

• A． It
• B． What
• C． This
• D． That

Answer 1

分析 我女儿玩她的手机每天都玩很长时间，这让我很担心．

解答 答案A．
代词it作形式主语，代替真正主语，真正主语被后置．
真正的主语是从句"that my daughter plays with her cellphone for a long time every day"，故答案选A．B选项有很大的干扰性，如果选B，句子应该改为"What worries me is that my daughter plays with her cellphone for a long time every day．"this和that是代词，但不能够做形式主语，故可排除C和D两项．

点评 本题考查it做形式主语的用法．it 代替连词 that 引导的从句作形式主语．
常见的四种句型如下：1）it+be+过去分词+that 从句：It's said that Tom has come back from abroad．It was reported that dozens of children died in the accident．可用于该句型的过去分词还有：known，thought，told，believed，hoped，announced，expected，decided，suggested等，该句型常可以转换成含有宾语从句的复合句或者含有不定式作主补的简单句．
如：It's said that Tom has come back from abroad．→People say that Tom has come back from abroad．→He is said to have come back from abroad．
2）It+be+名词词组+that 从句：It‘s a pity that he can't swim for his age．It's a wonder that you could finish such a hard task in such a short time．
可用于该句型的名词词组还有：an honour，a good thing，a fact，a surprise，good news等．
3）It+be/seem+形容词+that 从句：
It is likely that they will beat us tonight．今晚很可能他们会赢我们．
It doesn't seem that she will give us a hand．她帮我们的可能性似乎不太大．
可用于此句型的开容词还有；wonderful，true，good，right，wrong，（un）important，useless，surprising，clear，possible，unusual，lucky，certain 等．
4）It+seem/appear/happen+that 从句：
It seems that he enjoys pop songs very much．看来他非常喜欢流行歌曲．
It appears that Tom might change his mind．看来汤姆会改变主意．
It happened that I went out that day．碰巧我那天外出了．