Living in the central Australian desert has its problems,______ getting water is not the least.A.for which\x05\x05 B.to which\x05C.in which \x05\x05D.of which选d、为什么,of还能用别的替换吗

Living in the central Australian desert has its problems,______ getting water is not the least.A.for which\x05\x05 B.to which\x05C.in which \x05\x05D.of which选d、为什么,of还能用别的替换吗
Living in the central Australian desert has its problems,______ getting water is not the least.
A.for which\x05\x05 B.to which\x05
C.in which \x05\x05D.of which
选d、为什么,of还能用别的替换吗

Living in the central Australian desert has its problems,______ getting water is not the least.A.for which\x05\x05 B.to which\x05C.in which \x05\x05D.of which选d、为什么,of还能用别的替换吗
定语从句,is not the least of its problems,表示从属关系吧!