ProfessorSmith,alongwithhisassistant

发布时间：2020-07-26 05:41:22

Professor Smith,along with his assistant,________ on the project day and night to meet the dead line．A.workB.workingC.is workingD.are working

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C解析考查主谓一致，句中主语是Professor Smith，故谓语动词用单数形式。
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