问题
单项选择题
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
答案
参考答案：C
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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
参考答案：C