That is the day ________ I'll never forget.
A．which B．on which C．in which D．when
Do you know the year ________ the Chinese Communist Party was founded?
A．which B．that C．when D．on which
This is the hotel ________ last month.
A．which they stayed B．at that they stayed
C．where they stayed at D．where they stayed
Do you know the man ________？
A．whom I spoke B．to who spoke
C．I spoke to D．that I spoke
The place ________ interested me most was the Children's Palace.
A．which B．where C．what D．in which
(2013·重庆，25)________ we have enough evidence，we can't win the case.
A．Once B．As long as C．Unless D．Since
