— She got her first science fiction published. It turned out to be _____.

— When was that?

— It was in 2009 _____ she was still in college.[ ]

A. success; that

B. a success; when

C. success; when

D. a success; that

以样本股每日收盘价之和除以样本数得到的股价平均数是（）。

A.综合股价平均数

B.修正股价平均数

C.加权股价平均数

D.简单算术股价平均数