题目内容

(2013·合肥一中二模)I don't know who invented ________ iphone，but I think it is ________ useful invention.
A．the；aB．the；theC．an；theD．an；a
A
句意：我不知道是谁发明了iphone，但是我认为它是一个有用的发明。前一空是类指，用定冠词；后一个空格是泛指，表示“一个，一种”。
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