she was luck because she () by the accident A.wasnot killed B.hadnot been killed

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shewasluckbecauseshe()bytheaccidentA.wasnotkilledB.hadnotbeenkilledshewasluckbecauseshe()bytheaccide

she was luck because she () by the accident A.wasnot killed B.hadnot been killed
she was luck because she () by the accident A.wasnot killed B.hadnot been killed

she was luck because she () by the accident A.wasnot killed B.hadnot been killed
B
过去完成时表示过去的过去已经发生了的动作