Only by chance （）.<br>A. I heard that her mother had died<br>B. did I hear that her mother had died<br>C. Had I heard that her mother had died<br>D. I had heard that her mother had died

Only by chance （）.
A. I heard that her mother had died
B. did I hear that her mother had died
C. Had I heard that her mother had died
D. I had heard that her mother had died

出自：国家开放大学管理会计案例

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