英语语法I can’t stand him.He always talks as though he _A_ every

I can’t stand him.He always talks as though he ___ everythin can't stand him.He always talks as if he—— everything,A,knew He talks as though he knew everything 急i just can't stand him any more.he is so easy to get angry. He always talks ___ he had been to outer space.A.like B.as i He always talks big! Every time I see him ,he is always reading something. I don't think you can persuade him; he always adheres to wha he always talks every loud in class这样可以吗 I don't like him,he often talks a lot but does____ He talks as though he _______(know)all about it.答案是KNEW.为什么? He talks as though he ___（know）all about it.请问这个应该填什么?