His plan when it was put into practice because he had not given enough attention to deta

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(答案→)A. broke down
B. broke up
C. broke out
D. broke away
解析：句意:因为他没有给出足够重视的这些细节，导致计划在实施过程中失败了。break down失败了； break up打碎； break out爆发； break away脱离。根据句意故选A。