A dog isn't easy( ) A take care B take care of C to take care of D to take care 选哪个?为什么?

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A dog isn't easy( ) A take care B take care of C to take care of D to take care 选哪个?为什么?

A dog isn't easy( ) A take care B take care of C to take care of D to take care 选哪个?为什么?
A dog isn't easy( ) A take care B take care of C to take care of D to take care 选哪个?为什么?

A dog isn't easy( ) A take care B take care of C to take care of D to take care 选哪个?为什么?
动词不定式作主语,也可以是动名词做主语,两个表示的意义差别,ing表经常,to do 表一次性完成的动作,to take care of sth.是固定搭配需要介词,具体不定式的用法去http://zhidao.baidu.com/question/189863000.html