The math’s problem remained confusing to the boy although ______ over and over._刷题宝

题干

The math’s problem remained confusing to the boy although ______ over and over.

A：explaining

B：being explained

C：explained

D：having explained

上一题下一题 0.0难度选择题更新时间:2018-01-16 08:01:46

答案(点此获取答案解析）

C

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(\vec{P B} + \vec{P C}) \cdot \vec{P A}

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