单选题Please supply us with 250 tons of fresh water. You are requested to deliver it on board（）.Atill FridayBon Friday at the latestCuntil Friday afterwardsDat Friday soonest
单选题
Please supply us with 250 tons of fresh water. You are requested to deliver it on board（）.
A
till Friday
B
on Friday at the latest
C
until Friday afterwards
D
at Friday soonest
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