单选题In old days  books f

问题补充：

单选题Inolddays,booksforblindpeopleusedpaper____againstmetalwiretoformletters.A.to pressB.pressingC.pressedD.which pressed

答案：

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。