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?（）<br>A:at once<br>B:as soon as<br>C:quickly<br>D:straight

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

出自：海船船员证

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