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高中语法英语填空题,Professor Smith,along with his assistants,_____ on

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高中语法英语填空题,
Professor Smith,along with his assistants,_____ on the project day and night to meet the deadline.
答案空中应填 is working 为什么?is working算什么成分?如果是非谓语应该填 working呀.
不是非谓语,是谓语.这个句子可以 这么分析Professor Smith is working on the project day and night to meet the deadline.along with his assistants,是插入语.所以is working作谓语.