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The old man had three sons, all of ____ died during World War Ⅱ.

A. whose             B. that               C. whom             D. who

The old man had three sons, all of ____ died during World War Ⅱ.

A. whose 　 B. that 　 C. whom 　 D. who

 The old man had three sons, all of ____ died during World War Ⅱ.