To make a string picture, first draw the outline on a card, then spread the glue you want to attach the string,
A. to which
B. on which
C. where
D. that
网友回答
A. to which
B. on which
(答案→)C. where
D. that
解析：考查从句，从句you want to attach the string不缺少成份，所以引导词在关系副词里选择，所以选C，to which表示在从句里缺少介词to；on which表示在从句里缺少介词on；that不做成份，只起引导作用