【題目】I hear that my brother won the singing competition last Friday , but I’m not sure _______ that.

A. over B. on C. about D. in

【答案】C

【解析】試題分析：句意：我聽說上周五我哥哥贏得了歌唱比賽，但是對此我不確定。根據(jù)固定短語：be sure about,對…確信，確定。根據(jù)句意及結(jié)構(gòu)，故選C。

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