【正确答案】正确答案：Are you sure about Simon’s disappointment?

【答案解析】解析：译文：你确定西蒙失望了吗?“be sure that分句”意为“确信……”，也可用于be sure about sth．，about后接名词作介词宾语，disappoint的名词形式是disappointment，同时Simon要用其所格形式。