15. Army comrades were surprised at seeing that the _____ corporal not only spoke up in the meeting, but had the _____ to censure the five-star general in person about his issuing _____ order without considering later repercussions. (A) taciturn； audacity； impetuous (B) obsequious； volatility； banal (C) reticent； dogmatism； sanctioned (D) laconic； presumption； pragmatic