An expert together with some assistants have been sent to help us with the project.
选择题,
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An expert, together with some assistants, have been sent to help us with the project.
此题为多项选择题。请帮忙给出正确答案和分析，谢谢！
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正确答案：have--has
考查主谓一致。此句主语是Anexpert，togetherwithsomeassistants只是插入语，所以谓语动词要用单数，have要改成has。注意with，togetherwith，aswellas，nolessthan，like，but，except等引出的短语跟在主语后，用逗号断开，这种属于插人语成分，不属于主语。