答案：
解析：
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
0
答案：
解析：
It was said that that boy said that that that that that teacher used in that sentence is an
adverb.
上面这句话中有8个“that”，其中用错的“that”有几个？
0
答案：
解析：
