－My parents         our home for a few hours when I arrived. I didn’t meet them.

－You could call them if you wanted to know where they were.

A．have been away from

B．had been away from

C．had left

D．had gone

信息编码是信息处理的一项重要基础工作，施工单位在进行建设工程项目成本项统一编码时，应综合考虑多项因素，下列除（）外均属于其考虑的因素。

A.工程款支付

B.标底价

C.施工成本分析

D.合同价