問題詳情：
The stories ______ were written by Mark Twain are often humorous.
A. that B. those C. who D. what
【回答】
A 考查定語從句的關係代詞。先行詞是the stories，指物，定語從句缺主語；先行詞在從句中充當主語。這時候可以填which與that。比對*，故選A。
知識點：定語從句
題型：選擇題
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