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    6．He can't run fastonaccount of his heart trouble．

    分析 由于心脏病他不能跑的太快．

    解答 答案：on
    此题考查固定短语，on account of表示"因为，由于"，如：She retired early on account of ill health．
    她体弱多病，所以提前退休．

    点评 考查单词填空，准确地理解题意、然后根据题意及提示确定所填单词词形，正确写出单词完成答题．

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