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【参考答案】

included→including。
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单项选择题
A．It has lost its primary oxygen sources.B．It has lost its backup oxygen sources.C．It has lost both the primary and the backup oxygen sources.D．It has lost neither the primary or the backup oxygen sources.
A．It has lost its primary oxygen sources.
B．It has lost its backup oxygen sources.
C．It has lost both the primary and the backup oxygen sources.
D．It has lost neither the primary or the backup oxygen sources.
填空题
to→on。
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