what is Dad and Peter doing?是否正确what 后应该用 is or are?

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what is Dad and Peter doing?是否正确what 后应该用 is or are?
what is Dad and Peter doing?是否正确
what 后应该用 is or are?

what is Dad and Peter doing?是否正确what 后应该用 is or are?
不对,is 改为 are
这里是Dad 和Peter 两个人作主语,谓语动词用复数形式.