come的过去分词是come
come came come
整篇文章的时态是过去时,讲述过去的一件事
用过去的过去的一个动作,表达过去的状态,自然史过去完成时啊
新概念3第一课有点不明白The experts were now fully convinced that the an
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新概念3第八课有个句子不太明白呀