We cannot process the order ___ we get a copy of the purchase order .

A until
B that
C because
D when

Correct Answer: until

Till/until some day can be both inclusive and exclusive. Until is defined as "up to the point in time or the event mentioned", but a day is not a point in time, rather it's an interval of 24 hours. In most cases it can be implied from the context: We are open Monday till Friday.
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