问题
选择题
This problem is said _____ three times. [ ]
A. to have been talked
B. to have discussed
C. having been discussed
D. to have been talked about
答案
答案：D
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This problem is said _____ three times. [ ]
A. to have been talked
B. to have discussed
C. having been discussed
D. to have been talked about
答案：D