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90% of the credit amount must be paid（） the presentation of documents.
90% of the credit amount must be paid（） the presentation of documents.
A、at
B、by
C、against
D、with
正确答案：C
上一条：
You（） for all the samples if they are not returned to us within 90 days.
下一条：
We can continue to offer credit（） if our customers meet their obligations.