题目内容：

they have never seen the film___?A.haven't they B.did they c. didn't they D.have they 说明原因

优质解答

选D
根据反意疑问句“前肯后否,前否后肯”的原则,前面有never(从不）,它是一个表示否定的词,所以后面应该是肯定的；又因为they have never seen the film 是现在完成时,所以我们还要用它的助动词have.