After people have learned that magnets attract things, centuries passed______they took note of the fact that magnets sometimes also repel things.

A．before

B．until

C．after

D．since

在日常会计处理实务中，企业运用会计政策变更来粉饰会计报表的主要形式不包括（）。

A.折旧政策的变更

B.长期股权投资核算方法的改变

C.会计报表合并政策的改变

D.虚拟交易虚增利润