问题补充：
Is some German friends visited last week?
A. this school
B. this the school
C. this school one
D. this school where
答案：
A. this school
(答案→)B. this the school
C. this school one
D. this school where
解析：为便于理解，改写本句话：This is the school that some Germanfriends visited last week. 不难看出，作表语的the school是先行词。that引导了定语从句，因为that同时又作visited的宾语，所以被省略了。其它选项结构不对。
