title: Is_______someGermanfriendsvisite? 
desc: Is _______ some German friends vised last week?
  A. this school B. this the school C. this school one D. this school where 
  【答案】 
  【解析】
answer: 选 B
  改成陈述句，也许会更好理解些：
  This is the school (that) some German friends visited lask week.
  that 在从句中做宾语，可以省略