— Could you please tell us about some good ways to learn English?

— My suggestion is that reading often and writing regularly _____. [ ]

A. are needed

B. is needed

C. be needed

D. should need

在实施公开竞卖时，竞买人原则上不得少于（），人数不足的，可终止竞卖活动，重新组织竞卖程序或变更资产处置方式，但应事先在竞卖公告、竞卖邀请函或其他竞卖文件中向竞买参与人充分履行有关告知义务。

A.一人

B.二人

C.三人

D.四人