单选题 I said that I could not commit myself as my academic time was not yet finished, but I would like to be at their ______ later.
A. disposal B. guidance C. assistance D. supervision

【正确答案】 A

【答案解析】at one's disposal是固定搭配，“任凭他人调遣、使用”；assistance一般用于be of assistance to someone“帮助某人”；guidance用于under one's guidance“在某人的指导下”；supervision用于under the supervision of“在……监督下”。根据句意应选A。