单选题In order to maintain a safe speed at all times，any necessary alterations of speed must（）.Abe instantly put onBbe instant put into useCbe instantly put into effectDbe put immediately
单选题
In order to maintain a safe speed at all times，any necessary alterations of speed must（）.
A
be instantly put on
B
be instant put into use
C
be instantly put into effect
D
be put immediately
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