1. The voice of the verb is distinct from its tense. Don't confuse the passive voice with the past tense. (Sentence 2 happens to be in the past tense, but 3 is not; both 2 and 3 are in the passive ...
当前正在显示可能无法访问的结果。
隐藏无法访问的结果当前正在显示可能无法访问的结果。
隐藏无法访问的结果