向您请教几个英语问题.1,this project is known to(.) for three months.A.

向您请教几个英语问题.
1,this project is known to(.) for three months.
A.have been going on.B.be going on.
我在网上看,两个答案都有人选择,而且都给出了解释.
2.almost everyone fails (.) the final test on the first try.
A,to pass.B,in passing.这个也是都有人支持.到底是fail to do还是 fail in doing呢?
3.john suggested (,) anything about it until they found out more facts.Anot say.B,not saying.
有人支持说suggest+(should)+动词原型,有人说suggest ( not) doing.我不知道如何去面对了.