Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first______.
【正确答案】 B
【答案解析】句意：雪莱已为生物考试做了精心准备，以确保一次通过。intention意图，打算；at—tempt尝试，试图；purpose目的；desire渴望．愿望。