单项选择题 The price of commodities()on many factors like quality, demand, supply, etc.A、 is basingB、 has basedC、 is based

单项选择题 According to law, taxable services refer to transportation,()finance, insurance and the like.A、 operationB、 constructionC、 introduction

单项选择题 We will()an order with your company for digital cameras.A、 reserveB、 bookC、 place