Professor Smith has written some novels, but he is _____ known for his plays.
A.the best
B.more
C.better
D.the most
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C解析题意：史密斯教授写了很多小说，但是他更以剧本而闻名。此题首先不宜选B或D，因为 well known 的比较级和最高级通常是 better known和best known，有时也可以是 more well known 和 most well known，但通常不能是 more known 和 most known。至于是选A还是C，这就要看语境。由于句中涉及的只有 stories 和 plays 两个对象，故应选比较级。