有关高中定语从句的问题
Inthebaghefoundapieceofpaper______some specialwords.
Aonwhichwerewritten B onthatwerewritten
alltheapples__felldownwereeatenbythepigs.
Awhich Bthat
我已经排除了两个答案,选出正确答案后,请说明错误答案错在哪里,