Many people agree that there has never been a more splendid opening ceremony than of the

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A. one
(答案→)B. that
C. which
D. this
解析：这题考查代词的用法：that特指前面出现的单数名词，或是不可数名词，one是泛指前面出现的可数名词单数，which引导定语从句，this指代上文说的事，句意是：很多人同意在历史上没有比广州亚运会更辉煌的开幕式了。所以that是特指the opening ceremony选B。