In order to maintain a safe speed at all times，any necessary alterations of speed must（）.<br>A:be instantly put on<br>B:be instant put into use<br>C:be instantly put into effect<br>D:be put immediately

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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