They will not answer because ANY LOGICAL answer spears stright through the heart of their cult.
Dozens of websites like this have sprung up in the last few years. They claim more and more as time goes on the centrality of the Bible to their "doctrine" yet THEY WILL NOT USE THE JOSEPH SMITH "CORRECTLY TRANSLATED" VERSION. They even try to keep it's existence a secret from members and potential converts.
http://www.truemormondoctrine.com/key-mormon-doctrines/book-of-mormon-bible/
How can any HONEST church claim the "Book of Mormon" to be the most accurate book on earth because it was written by the man who "communed with God", yet his "translation" of the bible to be a fraud, and not use it ?
You already know the answer, and even when I restate it here, you will claim that we have not answered, but here we go anyways.
The LDS church publishes an English Bible that most mormons purchase and use both at church during instruction and at home for personal study. This Bible is the King James version. The church has included footnotes indicating places where the Joseph Smith translation is different from the tradtional King James text (and in cases where the section is longer - like several verses - includes it in the back of the Bible). But for day-to-day use Mormons use the King James Bible. BTW, the footnotes also include cross references to other verses, etc.
We do not ignore or hide the Joseph Smith translation, and one can purchase one with the changes in-line (replacing the King James text). But the Bible in our hands at church or when we are studying is the King James version.