单选题 At the international conference, the famous scientist gave an excellent report ______ on his recent experiment.
A) basing B) based C) to be based D) to base

【正确答案】 B

【答案解析】此题含义为：在国际会议上，这位著名的科学家做了个基于他现在的实验的精彩报告。句中report与base之间是被动关系，用base的过去分词作定语。