Living in the central Australian desert has its problems, ______obtaining water is not the least.

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问题 Living in the central Australian desert has its problems, ______obtaining water is not the least.

选项 A、of which
B、for what
C、as
D、whose

答案A

解析 句子的后半部分是带介词的非限定性定语从句,用来对主句作附加说明,which的先行词是problems。whose作关系代词引导从句时,只能作定语,所以用在此句是不对的。如:It was a meeting whose importance I did not realize at that time.那是一次会见,其重要性我当时没有认识到。whose用于指物时,有时可以与of which交替使用,但通常of which前面要有名词词组。如:He has written a book,the name of which(=whose name)I’ve completely forgotten.他写了本书,书名我忘记了。what作关系代词时,相当于the thing which,通常不出现先行词,用来引导表语从句、主语从句和宾语从句,因此在这里是不合适的。as作连词时,用来引导时间状语从句、原因状语从句和比较状语从句,用在此处不符合逻辑。
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