Tony is only three years old.He is too young to d() him self

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• Tony is only three years old.He is too young to d() him self
• Jenny is only three years old.she is too young______alone at home.A.to leave 动词不定式一般式主动形式B.to be leaving 动词不定式进行时主动形式C.to be left 动词不定式一般是被动形式D.to have been left 动词不定式完成时被动形式答案是C,但我的疑问是D为什么不行?她被留在家里,因此可以排除AB,那么CD都是被动形式,只是时态不同,在这道题中该怎么判断呢?是因为she后面的be动词已经是is了,所以就代表这是一般式吗?
• Tony is only three years old.He is too young to d() him self
• He is only three years old,＿＿he can't go to school.A.and B.but C.so D.becausethanks.
• Where are you from?--I’m from the United States可以是Where are/is you/He/She from --I'm/He's/She's from the .(国名）吗?我是说语法形式是不是这样？