He took delight ______ achieving every concrete goal he had set.

He took delight ______ achieving every concrete goal he had set.
A、at
B、in
C、for
D、with
【正确答案】：B
【题目解析】：本题考查词组take delight in sth. / doing sth.:以某事/做某事为乐，介词in不可换成其他介词。题意为：他以实现他所设定的每个具体目标为乐。答案为B。