单选题The establishment of INMARSAT as an independent organization marked a great step forward for maritime radio communications. What does “marked a great step” mean in the sentence?()ATo run faster than everBTo go forwardCTo march without stoppingDA significant symbol of a great improvement in maritime communication
单选题
The establishment of INMARSAT as an independent organization marked a great step forward for maritime radio communications. What does “marked a great step” mean in the sentence?()
A
To run faster than ever
B
To go forward
C
To march without stopping
D
A significant symbol of a great improvement in maritime communication
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