Institution: Bangladesh Bank Exam: Officer (General) |-Sonali | Janata | Bangladesh Krishi_Bangladesh Development bank ২৪.০৫.২০১৯ ||
Topic: English literature, Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

In the sentence "We cannot process the order ___ we get a copy of the purchase order," the correct option is "A) until." This choice indicates that processing the order is contingent upon receiving a copy of the purchase order. The word "until" signifies a specific condition that must be met before the main action (processing the order) can take place.

Using "until" suggests that the action cannot and will not happen prior to receiving the needed documentation. In contrast, the other options do not fit the context properly. "That" introduces a defining clause but does not indicate a temporal relationship, while "because" suggests a reason for not processing the order, which conflicts with the intended meaning. "When" implies a timing aspect without the conditional nature of "until," leading to potential confusion about whether the processing could start at some point in the future.

Thus, "until" is the most appropriate word, as it clearly communicates that the processing of the order is deferred specifically until the purchase order is received.