The door_.Better repaired.a.isn't shut b.hasn't been shut 为何选b ,a 错在哪

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Thedoor_.Betterrepaired.a.isn''tshutb.hasn''tbeenshut为何选b,a错在哪Thedoor_.Betterrepaired.a.isn''tshutb.has

The door_.Better repaired.a.isn't shut b.hasn't been shut 为何选b ,a 错在哪
The door_.Better repaired.
a.isn't shut b.hasn't been shut
为何选b ,a 错在哪

The door_.Better repaired.a.isn't shut b.hasn't been shut 为何选b ,a 错在哪
b的意思是这个门已经关不上了,最好修一下.
门关不上是过去时,已经发生的事情,所以不能选a.a是一般现在时