这句话,主语是?

问题描述:

这句话,主语是?
Which country will be the host country for the next Olympic Games?
哪个国家将是下届奥运会的主办国?
我感觉,是 Which country

主语:which country
系动词:will be
表语:the host country
补语:for the next Olympic Games
时态:一般将来时
句子形式:特殊疑问句
回答:London (will be).