Living in the central Australian desert has its problems,__o____ obtaining water is not the least.为什么填of whichHe _______ my letter that I sent last month.A.replied to B.replied C.answered to D.answered for为什么选A

Living in the central Australian desert has its problems,__o____ obtaining water is not the least.为什么填of whichHe _______ my letter that I sent last month.A.replied to B.replied C.answered to D.answered for为什么选A
Living in the central Australian desert has its problems,__o____ obtaining water is not the least.
为什么填of which
He _______ my letter that I sent last month.
A.replied to B.replied C.answered to D.answered for
为什么选A

Living in the central Australian desert has its problems,__o____ obtaining water is not the least.为什么填of whichHe _______ my letter that I sent last month.A.replied to B.replied C.answered to D.answered for为什么选A
of which=whose是名词所有格,表示"某某的"第一句话的意思是在澳大利亚中部的沙漠居住会(遇到)一些问题,它的取水(的问题)还不是最基本的.因为obtaining water是个动名词词组,是名词性质的,所以前面会用所有格来修饰
第二题reply to 表示回信,是个固定搭配

of which=where
代指desert
有不会的可以再问我

非限制定语从句，which代替problems，obtaining water 是其中问题之一。

根据题意可以知道考察非限定性定语从句 定语从句与先行词 problems 关系不密切，所以为非限制性定语从句 因为是指物的非限定性定语从句 所以选择用which引导 又因为取水问题只是其中之一 故为 of which
reply 是vi 意为回复 所以后面接 my letter 要用 reply+to...

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根据题意可以知道考察非限定性定语从句 定语从句与先行词 problems 关系不密切，所以为非限制性定语从句 因为是指物的非限定性定语从句 所以选择用which引导 又因为取水问题只是其中之一 故为 of which
reply 是vi 意为回复 所以后面接 my letter 要用 reply+to

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