Is _________ some American friends visited last yeat? is factory where is factory one is factory is the factory
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DThis is the factory (that) some American friends visited last year. （定语从句）=This factory is the one (that) some American friends visited last year. (So B,C are the wrong answers.) （定语从句）=This factory is what some American friends visited last year. （表语从句）做有关定语从句类题的要点：1）将否定句、疑问句改为陈述句，方便辨认句子的整体结构、缺少的成分。2）将定语从句改为两个简单句，方便辨认嵌套在从句中但不符合常规顺序的搭配、结构（尤其适用于选择介词时）
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D，this factory 作先行词
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D。 This is the factory (that) some American friends visited last year.
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答案应为D同意楼上所答
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D,this is the factory some American friends visited last year?
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C
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C