问题补充：
you lose the paper document, sign in , you might download all you need.
A. If, which
B. So long as, what
C. In case, where
D. Even if, as
答案：
A. If, which
B. So long as, what
(答案→)C. In case, where
D. Even if, as
解析：本题考查连词及定语从句。In case以防，万一。第二空先行词为在定语从句中作地点状语，故用关系副词where。句意：万一你的纸质文件丢失，在注册，在哪里你也许可以下载你所需要的。
