问题
选择题
Professor Smith, along with his assistants, ________ on the project day and night to meet the deadline.
A．work
B．working
C．are working
D．is working
答案
答案：D
考查主谓一致。along with连接两个主语，谓语动词根据前一个主语决定，故用单数，选D。
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