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．is working
D．are working
答案
答案：C
考查主谓一致。主语与along with 连用时不受其限制，谓语动词应与主语保持一致，题中主语为Professor Smith，所以谓语动词用单数形式，选C。