"Did you know if he has\had finish his work?"一句中应是if he has还是had?

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• "Did you know if he has\had finish his work?"一句中应是if he has还是had?Did you know if he has finished his work?注意：这里if是“是否”的意思
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• "Did you know if he has\had finish his work?"一句中应是if he has还是had?
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