Professor Smith,along with his assistants,——on the project d

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Professor Smith,along with his assistants,——on the project day and night to meet the deadline
A work B working C is working D are working
为什么不能选B呢,可以表示主动关系呀

选B没有谓语啊
选C,Professor Smith,为三单
再问：表示主动关系不是可以省去前面的谓语吗
再答：是的，在做动名词短语时。但要成句，首先要满足必要的句子成分，这里，is working是现在进行时，做谓语。只有此可选。希望对你有帮助，有不明白的地方再问哟！ (*^__^*)

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