问题补充：
The athlete’s family came to Beijing in August, 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：
A. in which
B. at which
C. why
(答案→)D. when
解析：考查名词性从句。句意为：那个运动员的全家在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。
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