，his suggestion is not helpful，though it sounds very interestingA. Generally speakingB. O

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A. Generally speaking
B. On the contrary
C. In particular
(答案→)D. To be honest
解析：考查短语辨析。语意：老实说他的建议虽然听起来很有趣但没有帮助。D项意为”老实说”符合语意A项意为”一般说来”B项意为”恰恰相反”C项意为”特别”。