There are some back-up satellites in the event of failure. If the operational satellite is out of work,（）.<br>A:communications in the whole system will stop<br>B:the global system will be damaged<br>C:the back-up one will take its place<br>D:the whole system will not work

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

出自：海船船员证

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