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
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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：C