She knows a lot about the film. She must have seen it before ?must she B. mustn’t she C.

问题补充：

She knows a lot about the film. She must have seen it before, ?

must she B. mustn’t she C. has she D. hasn’t she

答案：

解析：考查反义疑问句.对已发生的过去情况的推测，若陈述句谓语部分有“must have done”，而且有表示过去的时间状语，问句部分用didn’t；若没有表示过去的时间状语，问句部分用haven’t或hasn’t,she为第三人称单数,故选D.