16．B先行词days在从句中作动词spent的宾语，故应用that或which或省略。

15．A此处为同位语从句。

14．Dwhen引导的非限制性定语从句，先行词在从句中作时间状语。

13．D“It is three hours that it takes the boy whose family…”。

12．Dthe judge gave a prize to sb., I have been taught by the teacher.

11．B此题是把定语从句和强调句结合起来考查学生的能力。

10．APut the book where it was是地点状语从句，因where前没有表示地点的先行词，put the book on the desk where it was是定语从句。

9．A这是强调句的特殊疑问句形式。“It is/was+强调部分+that+其他”。

8．D此题同样是非限制性定语从句，which代替前面一句话。

7．Dgreet the 21st century with…故应用with which。