问题
单项选择题
（）it is advisable to remain on a VHF channel 8, say: “stand by on VHF channel 8”.
A.That
B./
C.When
D.What
答案
参考答案：B
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（）it is advisable to remain on a VHF channel 8, say: “stand by on VHF channel 8”.
A.That
B./
C.When
D.What
参考答案：B