问题
                    
Look, those great notebooks are ______in our school store. Let’s have a look.—OK. Anybody can ______ the prices.[ ]
                            A: sell, buy
B: sell, afford
C: on sale, afford
D:on sale, sell
                        
                        B: sell, afford
C: on sale, afford
D:on sale, sell
正确答案是: