高等继续教育 / 经贸英语
正确率:100%
题型描述: 单选题
90 percent of the credit amount must be paid _ _ _ _ the presentation of documents.
A.at
B.by
C.against
D.when
90 percent of the credit amount must be paid _ _ _ _ the presentation of documents.
A.at
B.by
C.against
D.when
参考答案: