he___ (study) at this school since he ___(come) to this city.

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he___ (study) at this school since he ___(come) to this city.
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he___ (study) at this school since he ___(come) to this city.
he___ (study) at this school since he ___(come) to this city.

he___ (study) at this school since he ___(come) to this city.
has been studying came

0.0

has studied, came

is studing came

现在完成时,从过去持续到现在的一种状态,has studied
一般过去式,过去发生的事,came

He has studied at this school since he came to this city

has studied
came

has studied, came