We can hardly believe his excuse for his late show _______ his car broke down halfway.

A．why

B．that

C．where

D．as

下面关于订单项号及定单号的说法正确的是（）

A.订单项号：对应服务开通系统中客户订单编码，查询时需要去掉区号

B.定单号：对应服务开通系统中定单编码，查询时需要去掉区号

C.一个订单项号下有多个定单号

D.一个定单号下有多个订单项号