In old days, books for blind people used paper ____ against metal wire to form letters.A.to pressB.pressingC.pressedD.which pressed
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C解析考查非谓语动词，根据句子结构可知use paper to form letters,所以pressed against metal wire作paper的定语，即which was pressed against metal wire . 意为在古代，给盲人看的书用压在金属丝上面的纸来构成字。