单选题Before（）, a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.AtransmitBto transmittingCtransmittingDin transmitting
单选题
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
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