A.what you have told usB.which you had told us

C.what you told usD.that you told us

【答案】C

【解析】

考查宾语从句。句意：你告诉我们的事使我们感到很有趣。分析句子可知，by为介词后接句子作宾语。宾语从句中what作told的直接宾语，所以连接词为what。故选C项。