I don’t know who invented _______ telephone, it’s really _______ most useful invention.
A．the; aB．the; theC．a(chǎn); aD．不填；不填
A
考查冠詞。句意：我不知道誰(shuí)發(fā)明了電話(huà)，這真是一個(gè)有用的發(fā)明。結(jié)合語(yǔ)境可知前文特指某個(gè)物品，故用定冠詞the。下文泛指任何一項(xiàng)發(fā)明，故用不定冠詞。選A。
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