单选题If two fuel service tanks are installed, the empty tank should be pumped up directly it is emptyWhat is the meaning of “directly” in the sentence above?（）Aat onceBas soon asCquicklyDstraight
单选题
If two fuel service tanks are installed, the empty tank should be pumped up directly it is emptyWhat is the meaning of “directly” in the sentence above?（）
A
at once
B
as soon as
C
quickly
D
straight
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