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    精英家教网 > 高中英语 > 题目详情
    I don’t know who invented _____ iPhone, but I think it is____ useful invention．
    A．the; aB．the; the C．an; theD．an; a
    A

    试题分析：考查冠词：句意：我不知道是谁发明了iPhone，但是我知道这是有用发明。第一空填the ，the iPhone是特指发明物，第二空填a，invention是可数名词，这里泛指一个有用的发明，选A。
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