the last bus_,we had to walk home a going b having gone c has gone d had gone

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thelastbus_,wehadtowalkhomeagoingbhavinggonechasgonedhadgonethelastbus_,wehadtowalkhomeagoingbhaving

the last bus_,we had to walk home a going b having gone c has gone d had gone
the last bus_,we had to walk home a going b having gone c has gone d had gone

the last bus_,we had to walk home a going b having gone c has gone d had gone
b

c

为什么是b???

D 由主句的过去时知,车在这之前已经走了,因此用过去完成时表示事情发生在过去的过去,并且对现在造成了影响:我们不得不走回去