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I don’t know who invented __________ telescope, but I think it is __________ most
useful invention.
A.the, theB.the, aC.a, theD.a, a
B
考查冠词的用法。第一空:发明物的前面必须加the,第二空:泛指一项非常有用的发明,所以用不定冠词a,故选B。
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