某经销商受业主委托与设备生产厂签订设备采购合同时，事先必须从业主处取得 ( )。
A．委托授权书B．设备图纸C．设备清单D．履约保函
参考答案：A
33．With the car____down halfway on the road, we had great difficulty walking home in the snow.
A．breaking
B．broken
C．to break
D．being broken
