__is impolite to laugh at others when they are in trouble

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__is impolite to laugh at others when they are in trouble
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__is impolite to laugh at others when they are in trouble
__is impolite to laugh at others when they are in trouble

__is impolite to laugh at others when they are in trouble
答案是 It
It's adj.to do sth 固定用法
加油!不明白再问!

_It_is impolite to laugh at others when they are in trouble。
考察it作形式主语的用法,真正主语是后面的不定式to laugh at others。
当人们处于困境中的时候,嘲笑他们是不礼貌的。