The seller would sell the skirt for 50 dollars, but the customer ________ only half the price, and finally they agreed ________ the price．
A.supplied; onB.charged; onC.offered; withD.offered; on在线课程D
解析：
charge“要价”，不是顾客的所为，排除B项；supply“供应”；agree with意为“同意某人的意见”；agree on意为“意见一致”。