单选题 Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first endeavor .
【正确答案】 B
【答案解析】[解析] 句意：谢丽为生物考试做了细致的准备，她确信一次就可以通过。intention：目的、意图，attempt：尝试，最符合题意，purpose：目的，desire：愿望。