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A．It has lost its primary 6xygen sources.B．It has lost its backup oxygen sources.C．It has lost both the primary and the backup oxygen sources.D．It has last neither the primary or the backup oxygen sources.
A．It has lost its primary 6xygen sources.
B．It has lost its backup oxygen sources.
C．It has lost both the primary and the backup oxygen sources.
D．It has last neither the primary or the backup oxygen sources.
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