The message you intend to convey through words maybe the exact opposite of others actuall

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A. why
B. that
C. which
(答案→)D. what
解析：考查从句，从句others actually understand缺少宾语，所以首先排除A，that可以做引导词，但是它没有实际意义；which可以做宾语，但是前面要有先行词，所以选D，句子意思“你打算查单词的信息可能是别人理解相反的东西”