I firmly believe he said at the meeting was right.A. thatB. whichC. that whatD. what that

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A. that
B. which
(答案→)C. that what
D. what that
解析：that 连接宾语从句作believe 的宾语，what连接  he said从句作said的宾语what he said at the meeting是一个主语从句。句意：我坚信他在会上所说的话是正确的。