We have received your letter of September 12，（）we are glad to know that you are interested in our electric heaters.
- A、which
- B、at which
- C、from which
- D、in which
正确答案:C
答案解析:有
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外销员
外销员
We have received your letter of September 12，（）we are glad to know that you are interested in our electric heaters.
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