A to know
seem 后面接不定式,表达“似乎...”
He seemed to know everything. 他似乎什么都知道,但事实上他什么都不懂.为什么不选B呢？有些句子中为了突出“某段”时间，是可以在seem 后面接完成式的，例如：John seems to have slept better the last few nights, the jet lag had really been bugging him for too long.这句话并没有时间上的讲究，简单过去时 seemed + 原形动词不定式 即可。