14/10/02 05:25:37.76 +AGuGdwJO
>>518
間違ってない
Everyone else had thought (that) it was impossible to do X.が元の形（itはto do Xを指す）
この文からXをwhatに替えて節の先頭に移動すりゃ、ご指摘の文は完成
ちなみにXをitの位置にtough移動させたEveryone else had thought (that) X was impossible to do.という形を想定すれば、what everyone else had thought (that) was impossible to doとなる
518の頭に浮かんでたのは後者でしょうね