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The classroom is very dirty.it is hard to clean it和it is har

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The classroom is very dirty.it is hard to clean it和it is hard to clean选哪个 有什么区别
The classroom is very dirty.it is hard to clean it和it is har
秃顶高手来了
哈哈,考得就是不定式哈.
its hard to clean ,所谓""反射性不定式"",其实就是to do it is hard .
its hard to do it ,不用.因为上面的更简洁,而且it 还重复了.--用这个会被美国佬笑话的