I don’t know who invented __________ telescope, but I think it is __________ most
useful invention.
A．the, theB．the, aC．a(chǎn), theD．a(chǎn), a
B
考查冠詞的用法。第一空：發(fā)明物的前面必須加the,第二空：泛指一項(xiàng)非常有用的發(fā)明，所以用不定冠詞a，故選B。
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