单项选择题

A.replyB.textC.timeD.answerA message by flashing light ……

A message by flashing light consists of the call，the identity，the ending，and the（）.

A.reply
B.text
C.time
D.answer

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A.poor
B.bad
C.fair
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A.RCC
B.OSC
C.CSS
D.GPS

单项选择题When my ship arrived there，their ship（）.

A.has left already
B.left already
C.had left already
D.would left already