高等继续教育 / 经贸英语
正确率：100%
题型描述: 单选题
We are establishing the relative L/C with the Bank of China, Shanghai and shall let you know by cable _ _ _ _ _ _ _ it is opened.
A.until
B.before
C.unless
D.as soon as
We are establishing the relative L/C with the Bank of China, Shanghai and shall let you know by cable _ _ _ _ _ _ _ it is opened.
A.until
B.before
C.unless
D.as soon as
参考答案：