Question

Mr. Wu___this math problem____him many times, but he still doesn’t understand it.

A．explains ; to

B．has explained ; for

C．has explained ; to

D．explained ; with

Answer 1

C

试题分析：句意：吴老师给他讲了几遍这道数学题目，但他还是不懂。句中用现在完成时，have/has+动词过去分词，表示过去发生的事情对现在有影响，主语是第三人称单数，所以用has explained; explain…to sb.向某人解释，介词用to，故选C。