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

解析試題分析：句意：吳老師給他講了幾遍這道數(shù)學(xué)題目，但他還是不懂。句中用現(xiàn)在完成時(shí)，have/has+動(dòng)詞過(guò)去分詞，表示過(guò)去發(fā)生的事情對(duì)現(xiàn)在有影響，主語(yǔ)是第三人稱單數(shù)，所以用has explained; explain…to sb.向某人解釋，介詞用to，故選C。
考點(diǎn)：考查時(shí)態(tài)。