He knew his daughter was crying what he had said.A. because B. because of C. withD. since

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A. because
(答案→)B. because of
C. with
D. since
解析：考查介词。because 作为连词后面是一个完整的句子。what he had said 作为一个单词，作为宾语，故用介词because of。句意：他知道他的女儿在哭，因为他所说的。