问题描述：
[单选]
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：查看无
答案解析：无
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答案解析：无
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上一篇：We regret we cannot（）you in this respect．
下一篇：We are looking forward（）receiving your enquiries soon．
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