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We have received your letter of September 12th，（） we are glad to know that you are interested in our electric heaters.

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

上一条：We regret having to remind you that 20% of the freight is still（）.

下一条：（）the low stock of such goods，we would advise you to accept our offer immediately.