题目内容
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 |
C
解析试题分析：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。
考点：考查反义疑问句
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