选A,解释如下：seem常用于it作形式主语的“It seems/seemed that……”结构，如：a) It seems that you were lying.b) It seemed that he had been a scientist.c) It seems impossible that he will be here tomorrow.[注]1）在这一句式中，常省去that，如例a可改为：It seems you were lying.2)间或在seem后可跟一形容词，如例c. 更多seem用法可参照 http://zhidao.baidu.com/question/149156283.html希望上述能帮助你！...
