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(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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