___ you lose the paper document, sign in www. Sina.com, __ you might download all you need.  
A．If, whichB．So long as, whatC．In case, whereD．Even if, as
C

試題分析:考查連詞用法。So long as “只要”；in case “萬一，以防”；even if “即使”根據(jù)上下文可以判斷前面是一種假設(shè)情況，而第二個句是非限制性定語從句，句意完整所以用關(guān)系副詞引導(dǎo)，由此可知答案選C。句意：萬一你丟了紙質(zhì)文件，你可以在新浪網(wǎng)注冊，然后下載你所需要的東西。
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