This problem is said three times at the meeting. However they haven’t arrived at a conclu

问题补充：

This problem is said three times at the meeting. However, they haven’t arrived at a conclusion now.

A. to have discussed

B. to have been discussed

C. having been discussed

D. having discussed

答案：

A. to have discussed

(答案→)B. to have been discussed

C. having been discussed

D. having discussed

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