问题
单项选择题
To increase the distance to the vessel ahead by reducing one’s own speed means（）.
A.fall back
B.keep low speed
C.running after
D.drop back
答案
参考答案：D
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To increase the distance to the vessel ahead by reducing one’s own speed means（）.
A.fall back
B.keep low speed
C.running after
D.drop back
参考答案：D