Paper is ________ useful invention.It was invented around 2,000 years ago by Cai Lun.( ?。?/h1>
【考點】不定冠詞(a,an).
【答案】A
【解答】
【點評】
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發(fā)布:2024/4/20 14:35:0組卷:96引用:7難度:0.7
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