Professor Smith, along with his assistants, on the project day and night to meet the dead

发布时间：2020-08-16 12:14:18


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

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A. work
B. working
(答案→)C. is working
D. are working
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