We are good friends though he is ten years to me.A. olderB. elderC. seniorD. more senior

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A. older
B. elder
C. senior
D. more senior
解析：考查词组：be senior to比…年长，句意：虽然他长我10岁，但我们是好朋友。选C。A项和than连用，B和姐姐，哥哥连用，senior没有比较级。选C。