You must have read about Dickens long ago,____? A.mustn't yo

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You must have read about Dickens long ago,____? A.mustn't you Bhaven't you C.can't you D.didn't you
答案是D,为什么不选B呢?什么时候反义疑问句里用B呢?谢啦!

1.must have read 表示：一定是做了某事.表达的是已经存在和发生的事情,而且你的句子里还有long ago,很显然是过去的事情.
2.mustn't you是你必须（干某事）吗?意思不对.
3.当have用作助动词时,就可以用Bhaven't you .如they have finished it,haven't they?

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