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The professor,or some of his assistants,are to attend our di

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The professor,or some of his assistants,are to attend our discussion.这句话主谓一致用的对吗?
请说明原因.
The professor,or some of his assistants,are to attend our di
不对
,or some of his assistants,只是插入语,可直接去掉分析句子成分
再问: 那如果去掉逗号,变为The professor or some of his assistants are to attend our discussion。这样对吗?
再答: 对,就近原则,但是and就不对了
再问: 如果保留逗号,变or为and,后面的谓语是不是也要变are为is才对?
再答: 是的