监理单位参与引进设备合同订立和履行管理的,其主体地位是()。
A.当事人
B.买方
C.代理人
D.第三人
参考答案:C
简述教学评价的基本步骤。
I met a friend of mine_________ in the street yesterday. We didn't meet on purpose. [ ]
A. by accident
B. by the end
C. by mistake
D. in the end