(2013·合肥一中二模)I don"t know who invented ________ iphone，but I think it is _______
题型：不详难度：来源：
(2013·合肥一中二模)I don"t know who invented ________ iphone，but I think it is ________ useful invention.| A．the；a | B．the；the | C．an；the | D．an；a |
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答案
| A |
解析
| 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”。 |
举一反三
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