In old days, books for blind people used paper against metal wire to form letters.
A. to press
B. pressing
C. pressed
D. which pressed
网友回答
A. to press
B. pressing
(答案→)C. pressed
D. which pressed
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。