We came to a place （ ） they had never paid a visit before.
（A）which
（B）in which
（C）on which
（D）to which
This was the best model of a radio set （ ） the factory produced in 1997.
（A）that
（B）where
（C）which
（D）when
The reason （ ） he didn't come was （ ） he was ill. 选项：
（A）why; that
（B）that; why
（C）for that; that
（D）for which; what
