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這句的附加問句位什麼不是 haven't she? 而是 wasn't she?
-She must have been there, wasn't she?

樓上大大恐怕沒搔到癢處; 既然說主句是完成式have been, 那附帶問句怎不用
haven't或hasn't? 發問者疑問依舊. 

must是情態助動詞沒錯, 本句重點在於:
must + have Vpp 表示對過去事物的推測,  其中must不是「必須」, 所以附帶問句不可用mustn't;
must have been there是過去時態, 如果除去推測語意, 可還原為過去時態的
直述式was there, 所以附帶問句要用wasn't she. 

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