题目选项分析

Some 200 world-famous physicists recently attended a conference whose purpose was not only to consider the prospects for the next 50 years of research in physics but also to assess the accuracy of the predictions made at the last meeting of this type,which took place 50 years earlier.

Some 200 world-famous physicists recently attended a conference whose purpose was to consider not only the prospects for the next 50 years of research in physics but also assessing the accuracy of the predictions made at the last meeting of this type,which took place 50 years earlier.