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A
didn’t they
B
don’t they
C
mustn’t they
D
haven’t they
正确答案 :D
解析
本题考查句法——特殊句式。
句意:宿舍里没有灯光。他们一定去听讲座了,不是吗?
D项:根据must have gone可知此处的反义疑问句是对过去情况的推测,且句中没有明确的表示过去的时间状语,反义疑问部分用haven’t或hasn’t,因为主句用的have,所以应该是haven’t they。符合题意,故选D。
A、B、C项为干扰选项,故排除。
故本题答案为D。
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