When we put the suggestion to him, he thought highly of it and was about its immediate ap

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A. curious
B. content
C. cautious
(答案→)D. enthusiastic
解析：形容词辨析。Be curious about…对…好奇；be content with对…满意；be cautious about对…谨慎；be enthusiastic about热衷于，对…充满热情；句意：当我们向他提出建议的时候，他对我们的建议高度评价，对于建议的立刻运用充满了热情。