to the conference, we have already discussed this problem among ourselves.
A. Similar
B. Previous
C. Cautious
D. Senior
网友回答
A. Similar
(答案→)B. Previous
C. Cautious
D. Senior
解析：B 考查词义辨析。“早在回忆之前，我们已经相互讨论了这个问题。”similar相似的；previous在以前；cautious谨慎的；senior高级的，年长的。故选B。