1.when and where to build the new factory --------- decided

1.when and where to build the new factory _________ decided yet.(A)
A.is not B.are not C.has not D.have not
2.- Is this rain coat yours
-No,mine _____ there behind the door.(B)
A.is hanging B.hangs
还有 hang 的过去式hanged,hung有什么区别,哪一个有别的意思?
第一题中有个YET 为什么不用完成时