We have time and again our position on Taiwan issue! Whatever happens, we won’t change it!

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A. explained
(答案→)B. clarified
C. introduced
D. concluded
解析：考查动词。句意是：我们已经反复阐明我们对台湾问题的立场，无论发生什么，我们决不改变。clarify one’s position阐明立场/观点；explain解释； introduce介绍；conclude总结。