问题
选择题
You must have read about Mark Twain long ago, ____?
A．mustn't you
B．haven't you
C．didn't you
D．needn't you
答案
答案：C
题目分析：考查反义疑问句。句中must have done 表示对过去的肯定推测，而且有明显的时间状语long ago。做反义疑问句时用助动词did，所以答案选C。
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