Catherine has been preparing carefully for the English examination,so that she can be sure of passing it at her first ________A.requestB.attemptC.promiseD.purpose
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B解析解析：考查名词辨析。由句意“凯瑟琳为英语考试一直做着精心准备，所以肯定第一次尝试便能通过。”得知此处为尝试。而request：请求；promise允诺；purpose：目的。均不合句意。