I explained the problem to him, but he did not believe ________. (我说的话)

I believe he has never ___________ explained how he came to be in such a condition.

I believe he has never ___________ explained how he came to be in such a condition. (satisfy)

I was a little disappointed with him because what he did does more to_____ the problem than to solve

If he __________ here yesterday, I would have explained to him myself.

A、

has been

have been

is

had been