you lose the paper document, sign in www. Sina., you might download all you need.
A. If, which
B. So long as, what
C. In case, where
D. Even if, as
网友回答
A. If, which
B. So long as, what
(答案→)C. In case, where
D. Even if, as
解析：
试题分析:考查连词用法。So long as “只要”；in case “万一，以防”；even if “即使”根据上下文可以判断前面是一种假设情况，而第二个句是非限制性定语从句，句意完整所以用关系副词引导，由此可知答案选C。句意：万一你丢了纸质文件，你可以在新浪网注册，然后下载你所需要的东西。