问题
选择题
Professor Smith, along with his assistant, ________on the project day and night to meet the deadline.
A．work
B．working
C．is working
D．are working
答案
答案：C
考查主谓一致。along with连接两个并列主语时，谓语动词和前一个主语保持一致，句子主语是Professor Smith,所以谓语动词用单数形式，选C。