---Mr. Bill always makes his class very lively and interesting. ---You are right. No one teaches ____.A.goodB.wellC.betterD.best
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C解析根据上一句的内容-Mr. Bill always makes his class very lively and interesting.，可知Mr Bill的课上的很好，而下文赞成这样的说法，他的意思是指没有人比他更好了，故用比较级，故选C