OG 41请教

41. Under a provision of the Constitution that was never applied. Congress has been required to call a convention for considering possible amendments to the document when formally asked to do it by the legislatures of two-thirds of the states.
(A) was never applied, Congress has been required to call a convention for considering possible amendments to the document when formally asked to do it
(B) was never applied, there has been a requirement that Congress call a convention for consideration of possible amendments to the document when asked to do it formally
(C) was never applied, whereby Congress is required to call a convention for considering possible amendments to the document when asked to do it formally
(D) has never been applied, whereby Congress is required to call a convention to consider possible amendments to the document when formally asked to do so
(E) has never been applied. Congress is required to call a convention to consider possible amendments to the document when formally asked to do so
The predicate has never been applied refers to a span of time, from the writing of the Constitution to the present, rather than to a past event (as was does), and the phrase is required indicates that the provision still applies.
这句解释我不明白，我还以为是从 never上看出要用完成时态的，可是为什么og的解释说，是从is required看出呢？