We are establishing the relative L/C with the Bank of China, Shanghai and shall let you know by cable ( ) it is opened.<br />A. until <br>B. before <br>C. unless<br>D.as soon as

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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

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