题目

It is clever ______ you ______ out the problem. A . for; to work B . of; working C . for; working D . of; to work 答案：D某校三个绿化小组一天植树的棵数如下：10，x，8，已知这组数据只有一个众数且众数等于中位数，那么这组数据的平均数是 ．