【单选题】His failure was due to he had never taken his study seriously.
【单选题】The boy‘s failure was due to continued ( ) his studies.
【单选题】His failure was due to ________ he had never taken his study seriously.
【单选题】最优二叉树(或哈夫曼树)是指权值为 W1, W2,。。。,Wn 的 n 个叶结点的二叉树中带权路径长度最小的二叉树。( )是哈夫曼树(叶结点中的数字为其权值)。
【单选题】His failure was due to ( ) he had never taken his study seriously.
【单选题】His failure in business was due not so much to ___________ as to his own mistakes.