67. 下列哪一敘述係用於還價之場合？ (A)To give you a general idea of our products, we are enclosing our catalogue for your reference. (B)A creditable sales network has been set up and we have our regular clients from over 10 countries and regions worldwide. (C)Your comments on our products will be really appreciated. (D)We found that your price is higher than the average in the market after careful examining.