单项选择题

What he said just now had little to do with the question（）discussion.

A. on
B. in
C. under
D. at

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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
单项选择题
All （）is a steady supply of water to the farmland.

A. which needs
B. that is needed
C. the thing is needed
D. need
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