题目内容
将下面句子变成倒装句
I knew an accident happened to him only when he told me about it．
→Only when he told me about it ________ ________ ________ an accident happened to him．
答案：did,I,know
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题目内容
将下面句子变成倒装句
I knew an accident happened to him only when he told me about it．
→Only when he told me about it ________ ________ ________ an accident happened to him．