In old days, books for blind people used paper ____ against metal wire to form l

In old days, books for blind people used paper ____ against metal wire to form l

题型:不详难度:来源:
In old days, books for blind people used paper ____ against metal wire to form letters.
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。
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