这里为什么不可以选B. The minister of finance is believed 
The Minister of Finance is believed to be thinking of imposing taxes to raise extra revenue
参考译文：人们认为/相信财政部长正在考虑强加征税，以提高额外的财政收入.
be believed to do sth和be believed to be doing sth区别如下
【1】A be believed to do sth 表示“人们认为/相信A将会做了某事”
The refugees from Syria are believed to cause the rise in r*pe in Germany.
人们相信叙利亚来的难民将会引起德国QJ案件数量的上升。
【2】A be believed to be doing sth 表示“人们认为/相信A正在做某事”
The refugees from Syria are believed to be flooding into Europe in millions.
人们相信叙利亚来的难民正在数以百万计地涌入欧洲。
