题目内容
12.It's impolite to shout at your mother like that.分析 句意:像那样对你妈妈吼是不礼貌的.
解答 答案:impolite 分析句子结构得知,本题考查it充当形式主语的用法,后面的动词不定式to shout at your mother like that像那样对你妈妈吼,是真正的主语,为了避免头重脚轻,而用it来代替动词不定式,因此次空缺少一个形容词,结合题意,答案是impolite(不礼貌的).
点评 it充当形式主语的用法:往往后面的动词不定式是真正的主语,为了避免头重脚轻,用it来代替动词不定式,而将其放在句子的后面.
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