填空题 During 1876 and 1889, Mark Twain wrote 1 books for which he is most famous.

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【正确答案】 1、three    
【答案解析】[详细解答] 本题是数字填空题,根据题目所给的时间是在马克·吐温结婚后的几年里,他共写作了三本很出名的书,见文章倒数第三段。