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I don’t know who invented _______ telephone, it’s really _______ most useful invention.
A.the; aB.the; theC.a; aD.不填;不填
A
考查冠词。句意:我不知道谁发明了电话,这真是一个有用的发明。结合语境可知前文特指某个物品,故用定冠词the。下文泛指任何一项发明,故用不定冠词。选A。
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