45．_______ I fixed the plug properly, I still got an electric shock.
A. Because B. However C. Although D. When

答案解析：

选C(Although)。该题考查语法：连词。句意为：尽管我妥当安装好插座，仍被电击了一下。Because因为，表示因果关系；However然而，用以引出令人吃惊或形成对比的话语；Although虽然，尽管；When当……。根据句意，选Although。