is a walk after meal goodor bad have has having hasing 原因

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is a walk after meal goodor bad have has having hasing 原因

填 having .
Is having a walk after meal good or bad
have (has )是动词,不能作主语,所以用动词ing 形式 having 作主语.
没有hasing 这个形式.
句意是:饭后散步有益还是有害?