英语现在完成时的问题We--that this is not possible

哈哈.这题不可能四个都可以嘛.楼主请看：
第二个是过去式,但是从句中是is所以第二个排除.第三个直接排除,我们将将坚信/认为,没这么说的.
个人觉得第一个和第四个都可以的.一个是我们认为,一个是我们一贯（始终）认为的意思.
A和D都没错吧.还是要看语境
have always believed 一贯认为 的意思 参看下列列句：
We have always believed that excellent companies are not only good product sales,but also is excellent talent and a good brand to provide customers with more high-quality products and services.
我们始终认为,优秀的公司不仅是销售好的产品,更是以优秀的人才和良好的品牌为客户提供更为优质的产品和服务.
I've always believed that and we have always believed it.
我始终相信,我们也始终相信如此.
For example,we have always believed that Chinese history Zhouwen Wang,King Wu of Zhou is no doubt sage.
例如,我们一向都认为中国历史上的周文王、周武王是不容置疑的圣贤.