【题目】Tom's comments on this issue are confusing because they appear to ______the remarks on the same issue made earlier by him.
A.violate
B.induce
C.clarify
D.contradict

【答案】D
【解析】考查动词辨析。A. violate违反；B. induce引起；C. clarify阐明；D. contradict否定。句意：Tom对这件事的评论是令人困惑的，因为它们似乎是他之前对相同问题的评论的否定。D项符合语境。