I told him what I was surprised his attitude towards his study.A. isB. wasC. at isD. at wa

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A. is
B. was
C. at is
(答案→)D. at was
解析：考查名词性从句。be surprised at sth.“因某事感到吃惊”；what I was surprised at是宾语从句的主语，宾语从句缺少谓语动词，根据told可知，用过去式。故选D。