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[单项选择]Living in the central American desert has its problems, ______ obtaining water is not the least.
A. of which t3. for what
C. as D. whose
A. as
B. whose
C. t3. for what
D. Living in the central American desert has its problems, ______ obtaining water is not the least.
E. of which
[单项选择]Living in the central Australian desert has its problems, ______ obtaining water is not the least.
A. for which
B. to which
C. of which
D. in which
[单项选择]Living in the desert of Africa has its problems; ______ obtaining fresh water is not the least.
A. with which.
B. for which
C. of which
D. which