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teachingthechildrenchineseisgreatfun中为什么用teaching?而不用teach或者toteaching?

题目详情
teaching the children chinese is great fun中为什么用teaching?而不用teach 或者to teaching?
▼优质解答
答案和解析
动词的不定式或者是动名词可以作主语.所以to teaching 是不对的.