有专家认为，介于随机抽样和非随机抽样之间的技术是（）。
A.简单随机抽样
B.分层随机抽样
C.分群随机抽样
D.系统随机抽样
参考答案：D
企业国有产权拍卖的程序有哪些？
Since last term, each of them () an English dictionary.
A．had
B．has
C．has had
D．have had
