单项选择题

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
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单项选择题
______ he works hard, I don't mind when he finishes the experiment.
A．As soon as
B．As well as
C．So far as
D．So long as
单项选择题
Although he knew little about the large amount of work done in the field, he succeeded ______ other more well-informed experimenters failed.
A．which
B．that
C．what
D．where
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