单选题 At the age of 40, he had already ______ a great fortune through successful financial dealings.
【正确答案】 C
【答案解析】[解析] 在给出的选项中:pierced“洞悉,穿透”;assessed“评估”;amassed“积聚, 积累”;agitated“焦虑,鼓动”。根据句意和各个选项的意思可知,正确答案是C。