定语从句Some students think that learning a foreign language is

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定语从句
Some students think that learning a foreign language is slow and difficult just think of the hours of hard work ( ) they have spent learning it.
A which B when C while D in which
选A,为什么,最好分析一下成分

定语从句很重要的一点就是关系代词在句子里面要充当成分.
这句话hours是先行词,从句（they have spent learning it）中,缺少spend的宾语.which充当从句中的宾语,指代hours

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