这个我们初中讲过.
因为这个句子里面有具体表示过去的时间状语 yesterday,所以反义疑问句要用didn"t,如果没有yesterday这个具体表示过去的时间状语,那么就用hasn"t
即：bill must have got the book yesterday,didn"the?
bill must have got the book ,hasn"t
he?所以这两个句子都是对的
bill must have got the book yesterday,___he?(didn"t)为什么不填has
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