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

题干

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

上一题下一题 0.65难度单选题更新时间:2013-12-26 09:31:15

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