单选题The firing of a red star signal may mean（）.AThis is the best place to landBYou are seen - assistance will be given as soon as possibleCTail block is made fastDSlack away
单选题
The firing of a red star signal may mean（）.
A
This is the best place to land
B
You are seen - assistance will be given as soon as possible
C
Tail block is made fast
D
Slack away
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