Выберите правильную грамматическую форму.He could see that the bed was empty and ... .a)was not slept inb)had not been

He could see that the bed was empty and had not been slept in.

— Он мог видеть, что кровать была пуста и не смята.

He couldn\'t see that the bed was empty and had not been slept in.

Could he see that the bed was empty and had not been slept in?

Who could see that the bed was empty and had not been slept in?

He could see that the bed was empty and had not been slept in, could not he?

Could he or could we see that the bed was empty and had not been slept in?