Have you paid for the vcd?not yet 为啥要用paid for不用spend on?
问题描述：
Have you paid for the vcd?not yet 为啥要用paid for不用spend on?
答
pay for something 为什么买单
spend something(钱或时间) on something 在什么上花费什么
这句话如果用后者就会缺少宾语,所以是paid for