题目

With his attention (focus) on his homework, he forgot all about what I had told him. 答案:【1】focused 设集合M={x|0<x≤3},N={x|0<x≤2},那么“a∈M”是“a∈N”的(  ) A.充分不必要条件                        B.必要不充分条件 C.充要条件                                       D.既不充分也不必要条件
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