题目内容
20.It's a bad mannerto laugh at people in trouble.(laugh)嘲笑处于困境中的人是不礼貌的.
分析 根据句意"嘲笑处于困境中的人是不礼貌的"可知该句应该用短语"嘲笑":laugh at.
解答 该题考查it代替后面的to不定式做形式主语的句型;laugh at 是固定词组,意为"嘲笑"之意.根据句子中的It's a bad manner可知it应该是形式主语;真正的主语是应该是后面的不定式to laugh at …;故答案为:to laugh at.
点评 用单词的适当形式填空需要根据句意以及单词在句子中所做的成分作出判断;还要熟练掌握常用的固定短语.
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