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
【题目解析】：from which指代from the letter，意为“从信中”
We have received your letter of September 12th, ______ we are gl
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