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    精英家教网 > 高中英语 > 题目详情
    _____ many times, but he still doesn’t know how to operate the machine properly.
    A．Although I have shown himB．I have shown him
    C．Having been shownD．Having shown
    B
    考查句子结构。因为句子中有but,所以前面也应该是一个句子。答案为A。如果本题没有but,答案就应该是C。句意：我已经给他展示过很多次了，但是他仍然不知道怎么样恰当地操作机器。
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