单选题There are some back-up satellites in the event of failure. If the operational satellite is out of work,（）.Acommunications in the whole system will stopBthe global system will be damagedCthe back-up one will take its placeDthe whole system will not work
单选题
There are some back-up satellites in the event of failure. If the operational satellite is out of work,（）.
A
communications in the whole system will stop
B
the global system will be damaged
C
the back-up one will take its place
D
the whole system will not work
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