Have you finished the plan? ——Yes, and it_____ by the experts for three times. A. was being studied B. has studied C. has been studied D. studied
A.A
B.B
C.C
D.D
正确答案是C
Have you finished the plan? ——Yes, and it_____ by the experts for three times. A. was being studied B. has studied C. has been studied D. studied
A.A
B.B
C.C
D.D
正确答案是C