No student could answer that question, enven Yao, who was

不能,No student could answer that question。这是一个完整的句子。even Yao, who was usually quick in answering questions, was silent。这也是一个完整的句子。even在这里是副词,表示“甚至”,它不能作为连词（and,but等）用连接两个分句,也不是从句引导词引导从句。所以这两个句子之间要么是句号,要么是分号,不能是逗号。【英语专业八级,欢迎追问】