根据《信访条例》的规定，信访事项应当自受理之日起( )日内办结
A．15
B．20
C．30
D．60
参考答案：D
The shop isn't ________now. It ________ at 9 every morning.[ ]
A. opened, open
B. open, opens
C. opening, opens
D. opened, opens
农产品的运输是连接商品与销售之间的桥梁。也是（）中的不可缺少的环节
