The conference organizer expressed their sincere thanks to Dr. Raymond, ____gave an insightful speech at the opening session.

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问题 The conference organizer expressed their sincere thanks to Dr. Raymond, ____gave an insightful speech at the opening session.

选项 A、if
B、anyone
C、he
D、who

答案D

解析应该选择同时具有“连词+主语”作用的关系代词who。if是表示假设的连词，anyone和he都是代词，不能连接句子。

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