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6. that/which 根据先行词activities表示事情, 我们可知填上that/which，在从句中作宾语。 7. who/that 从先行词和句子结构可知正确答案，who/that作主语。 8. which 根据前面的介词into以及先行词English，我们可知答案。 9. which 根据前面的介词through，我们可知填上which, which在这里是修饰前面整个句子。 10. As 引导定语从句，意思是“正如”。 三、单句改错 Ⅰ.名词性从句 1. Exactly how the tomato was introduced into Europe is uncertain, but it was probably around 1565. how→ when 由1565可知，不能确定的是番茄被引入中国的“时间”，故用when引导主语从句，在从句中作时间状语。 2. Grandma pointed to the hospital and said, “That’s when I was born.” when→ where 医院应是她出生的“地点”，故用where引导表语从句，在从句中作地点状语。 3. “Every time you eat a sweet, drink green tea.” This is that my mother used to tell me. that→ what 意思是“这就是我兄弟以前常常跟我说的”，在表语从句中作tell的宾语，故用连接代词what。 4. It makes the book so extraordinary is the creative imagination of the writer. It→ What 引导主语从句并在从句中作主语，用连接代词what。 5. From space, the earth looks blue. This is how about seventy-one percent of its surface is covered by water. | 
