12．I don't know who invented _______ telephone，it's really _______ most useful invention．（　�。�
A．the； aB．the； theC．a； aD．不填；不填

分析 我不知道誰(shuí)發(fā)明了電話，它真是最有用的一項(xiàng)發(fā)明．

解答 答案：A
句中the telephone表示類指，要用定冠詞來(lái)限定；a most useful invention表示有用的一項(xiàng)發(fā)明，most表示程度，修飾useful，不是最高級(jí)；表示泛指一個(gè)，要用不定冠詞來(lái)限定．故選A．

點(diǎn)評(píng) 冠詞是一種虛詞，本身不能獨(dú)立使用，只能放在名詞前幫助說(shuō)明名詞所指的人或事物，它是英語(yǔ)詞性中最小的一類，只有三個(gè)，一種是不定冠詞a，an；一種是定冠詞the．此外也有些特定場(chǎng)合不用冠詞，即通常所稱的零冠詞．不定冠詞表示泛指，定冠詞表示特指．

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