( )往往是立法的先导,经过一段时间的实践后,转化为更为规范和稳定的法律。
A.决议
B.文件
C.制度
D.政策
参考答案:D
—Miss wang once art at Bardon School for ten years and now is a singer.
—No wonder I often hear her sing in the garden.
A.had taught
B.taught
C.is teaching
D.has been teaching
( )应在投标人须知中规定的时间和地点进行,并邀请所有投标人出席。
A.评标B.开标C.定标D.投标