主谓一致问题No visitor or relative can enter the patient's room unless ____ by the doctor.这里根据or连接两个并列主语的谓语动词就近原则,应填he is invited.但为什么不能填being invited?

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主谓一致问题No visitor or relative can enter the patient's room unless ____ by the doctor.这里根据or连接两个并列主语的谓语动词就近原则,应填he is invited.但为什么不能填being invited?
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主谓一致问题No visitor or relative can enter the patient's room unless ____ by the doctor.这里根据or连接两个并列主语的谓语动词就近原则,应填he is invited.但为什么不能填being invited?
主谓一致问题
No visitor or relative can enter the patient's room unless ____ by the doctor.
这里根据or连接两个并列主语的谓语动词就近原则,应填he is invited.但为什么不能填being invited?

主谓一致问题No visitor or relative can enter the patient's room unless ____ by the doctor.这里根据or连接两个并列主语的谓语动词就近原则,应填he is invited.但为什么不能填being invited?
unless后面要跟个句子啊,有主句和从句之分的