Much to our , he didn’t do what he had promised. A. satisfactionB. dissatisfyingC. satisfy

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A. satisfaction
B. dissatisfying
C. satisfying
(答案→)D. dissatisfaction
解析：词义辨析。Satisfaction名词满意；dissatisfying不满足；satisfying 令人满足的； dissatisfaction 令人不满的事物。句意：很让我们不满意的是，他没有完成他的承诺。to one’s + n.故选D。