单项选择题
In the IMO SMCP the situations（）phrases using the work “can” appear it clear whether a possibility is referred to.
A.where
B.when
C.after
D.unless
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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 -
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（）we stand away from the church bell, it takes time for the sound waves to each us.
A.If
B.Whenever
C.Because
D.Where -
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Before（）,a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.
A.transmit
B.to transmitting
C.transmitting
D.in transmitting
