They must be waiting for us,()?a.aren't they b.mustn't they 求辨析
They must be waiting for us,()?a.aren't they b.mustn't they 求辨析
英语人气：332 ℃时间：2019-08-22 18:54:04
优质解答
情态动词的反义疑问句,must的反义疑问句固定,根据后面所跟的动词来觉得,此处是be动词,所以就是aren't they
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