We have received your letter of September 12，（）we are glad to know that you are interested in our electric heaters.<br>A:which<br>B:at which<br>C:from which<br>D:in which

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

出自：外经贸英语

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