1. 答案isn't it是错误的,正确答案是D is it.2. 解释:1)此处can表否定的推测,其反意疑问句和can无关,类似用法如must表“一定/必定”。2)做此类型的题目时,必须去掉can,然后再改写句子成:It isn't your father, is it?3) 再如:It must have rained last night, didn't it?He must have been to Beijing, hasn't he?She can't be in the classroom just now, was she?