Tom told us all that he said at the meeting was really trueA. thatB. allC. whatD. which

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A. that
B. all
(答案→)C. what
D. which
解析：句意：汤姆告诉我们所有的人，在会议上他所说是真的。这里的all和us是同位语，做主句的宾语，that引导的是宾语从句，宾语从句中的谓语是was really true，前面是主语从句，主语从句中用what引导，在句中作said的宾语。所以选C。