"You know so much about literature. It's a pity you failed your degree," Harry said, "You ______ a good teacher."A.would have beenB.can have beenC.must beD.should have been
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A解析语法结构题。本句的难点是：failed your degree是过去发生的行为，该句暗含这样一层意义： If you hadn't failed your degree you would have been a good teacher．本句的意思是：“约翰，你的文学知识很丰富，没拿到学位可真遗憾，”哈利说，“你本会成为一个好老师。”