劳务分包合同中，工程承包人收到劳务分包人递交的结算资料后( )天内进行核实。
A．7
B．14
C．21
D．28
参考答案：B
—Dad, did you ride a bike to school when you_____a boy?
—No, my family was poor, so I usually _____to school on foot.[ ]
A. are; go
B. were; go
C. is; went
D. were; went
变压器围栏上应有（）的明显标志.
