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再根据uses是谓语动词知空格处是主语，只有B项each of which能作主语，由此本句构成了定语从句。若选D项each of them，空格前后两部分需用转折连词but连接,即构成but each of them uses，或用独立主格结构each of them using it differently。 2．The children，________ had played the whole day long， were worn out. A．all of what B．all of which C．all of them D．all of whom 解析：句意：孩子们玩了一整天，都累坏了。分析句子结构可知，________had played the whole day long是非限制 性 定语从句，先行词children指人，故排除A、B、C三项 。所 以正确答案为D项。 D 3．At that moment，I was just standing by the window in my room，________ I could see what was occurring on the street. A．from which B．from whose C．from that D．from where 解析：考查定语从句。句意：那时，我恰好站在我的房间的窗边，从那里可以看到大街上正在发生的事。定语从句中的地点指by the window，而不是the window，因此是“从窗户处”而不是“在窗户”，故选from where。 D 考点四 特殊定语从句 1．(2017·高考重庆卷，T9)We’ll reach the sales targets in a month ________we set at the beginning of the year. A．which | 
