i would have gone to visit him had it been at all possible,but i __ fully occupied last week.A.was B.had beenhad it been是虚拟if 省略的倒装吗?

问题描述:

i would have gone to visit him had it been at all possible,but i __ fully occupied last week.
A.was B.had been
had it been是虚拟if 省略的倒装吗?