怎样用持续性动词就是说,有多少个常用的?什么时候用.bob-----for about two days.HIS mother is worried about himA has left home B didn't C has been ill这题就有关了吧?总之怎样用?

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怎样用持续性动词就是说,有多少个常用的?什么时候用.bob-----for about two days.HIS mother is worried about himA has left home B didn't C has been ill这题就有关了吧?总之怎样用?
怎样用持续性动词
就是说,有多少个常用的?什么时候用.
bob-----for about two days.HIS mother is worried about him
A has left home B didn't C has been ill
这题就有关了吧?总之怎样用?

怎样用持续性动词就是说,有多少个常用的?什么时候用.bob-----for about two days.HIS mother is worried about himA has left home B didn't C has been ill这题就有关了吧?总之怎样用?
c
如果是a
应为has been away from home
b连动词都没有
left就是那么离开一下,总不至于离开家门要花两天时间吧

left是瞬间动词,所以不选A
for about two days是个完成时态,B是过去式 ,所以不能选
故选C