Theprofessorandhisstudentsareworkingatweekendstheprojectintime．（）A.competingB.completesC.havecompletedD.tocomplete
The professor and his students are working at weekends _______ the project in time．（ ）
A. competing
B. completes
C. have completed
D. to complete
The professor and his students are working at weekends _______ the project in time．（ ）
The professor and his students are working at weekends _______ the project in time．（ ）A. competing
B. completes
C. have completed
D. to complete
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