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
I had hoped that I ______ you by talking about my children.
A. shouldn’t bore


B. wouldn’t bore
C. didn’t bore


D. hadn’t bored
单项选择题
He was ______ when he became president of the corporation.
A. at his forty


B. in his forty
C. of his forties


D. in his forties
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