12[单选题,5分] From the Chamber of Commerce in your city, we ________ about your various models of sewing machines. A.known B.have known C.learned D.have learned

12[单选题,5分] From the Chamber of Commerce in your city, we ________ about your various models of sewing machines.
A.known
B.have known
C.learned
D.have learned

出自：河南经贸职业学院-经贸英语

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