David had prepared carefully for the chemistry exam, as he wanted to be sure of passing i

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A. experiment
B. intention
C. aim
(答案→)D. attempt
解析：句意：大卫曾为化学的考试，认真地准备，因为他想确定第一次尝试就能通过考试。experiment 实验；intention意向，意图，目的；打算；aim 目标；attempt尝试，努力。故选D。
考点: 考查名词词义辨析的用法。