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researchers at the university of illinois have determined th

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researchers at the university of illinois have determined that the of a fath
researchers at the university of illinois have determined that the of a father can help improve a child’s grades.
a)involvement b)interaction c)association d)communication
为什么选A?解释一下
主体是 a father ,一个主体,单数.
A involvement参与.可行
b)interaction相互作用.最起码得有两个主体.
c)association 协会,最起码得有两个主体.
d)communication交流.最起码得有两个主体.
再问: http://zhidao.baidu.com/question/244857671.html http://zhidao.baidu.com/question/244115655.html 能再帮我看下这两个问题吗?