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
答案解析：无
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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