The two of them were as ______ as sisters.A. reverseB. intimateC. keenD. civil

本题考查对词汇含义的理解和运用。解题的关键在于准确把握每个选项单词的意思，并结合句子语境来判断哪个选项最符合逻辑。

• A选项“reverse”：其含义为“相反的；逆向的”。若将其代入句子 “The two of them were as reverse as sisters.”，句子表达的意思是“他们俩像姐妹一样相反”，这在逻辑上是不合理的，所以A选项不符合题意。
• B选项“intimate”：意思是“亲密的；密切的”。把它放进句子 “The two of them were as intimate as sisters.” 中，句子意思为“他们俩像姐妹一样亲密”，这与句子想要表达的两人关系状态相契合，在逻辑和语义上都是合理的，所以B选项正确。
• C选项“keen”：有“敏锐的；渴望的；强烈的”等意思。当把 “keen” 代入句子 “The two of them were as keen as sisters.” 时，句子 “他们俩像姐妹一样敏锐” 不符合正常表达习惯，不能准确描述两人之间的关系，所以C选项不合适。
• D选项“civil”：表示“文明的；有礼貌的”。将 “civil” 代入句子 “The two of them were as civil as sisters.” ，“他们俩像姐妹一样文明” 没有很好地体现出两人之间那种如同姐妹般的紧密关系，所以D选项也不正确。