though having discussed it for long they still heven't reached an agreement that they should pour
问题描述：
though having discussed it for long they still heven't reached an agreement that they should pour
more money into the project 这一句中为什么不用whether
答
agreement意思是协议,赞同,后面是赞同的具体内容,用that引导同位语从句,如果是whether,那么协议的内容是是否把钱投入这项计划中,而协议的内容是把钱投入计划中,就好比there is doubt 用whether,how,who等疑问词连接,因为doubt是怀疑的意思,怀疑的内容肯定是某件事是否,怎样等等,如果是there is no doubt只能跟that,因为no doubt没有疑问