问题
选择题
The athlete’s family came to Beijing in August,2008 to watch him play.That was
_____they began their contact with the large country with a long history.
A．in which
B．at which
C．why
D．when
答案
D
考查名词性从句。句意为：那个运动员的全家在2008年8月来到北京观看他比赛。那是他们和这个具有悠久历史的大国的接触的开始。“介词+关系代词”不能引导名词性从句，可排除A项和B项。根据语境，空白处表示时间，应选when。