have found 反义疑问句用什么 don't还是haven't?

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havefound反义疑问句用什么don''t还是haven''t?havefound反义疑问句用什么don''t还是haven''t?havefound反义疑问句用什么don''t还是haven''t?是hav

have found 反义疑问句用什么 don't还是haven't?
have found 反义疑问句用什么 don't还是haven't?

have found 反义疑问句用什么 don't还是haven't?
是haven't.
“一致性”在英语是个很重要的概念,人称一致、单复数一致、时态一致.,前后一致.此为前后一致.

是haven't?
如:They have found the lost boy, haven't they?