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[单选题]Social security benefits provide the main _____ of elderly people's income, folllowed by a pension from a former employer.NBz答案窝(daanwo.com)-大学生作业答案及考资分享平台
AresourceNBz答案窝(daanwo.com)-大学生作业答案及考资分享平台
BmaterialNBz答案窝(daanwo.com)-大学生作业答案及考资分享平台
Csource

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