（单选题）
Your database is in the NOARCHIVELOG mode. Since last night’s offline backup， the logs in group 1 have been written to twice. This morning， the SYSTEM data file has become corrupted. Up to what point can it be recovered？（）
Auntil the last commit
Bcannot be recovered
Cuntil the last offline backup
Duntil the beginning of the last transaction
正确答案
答案解析
略
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