The Whites stayed in England for half a month, they visited most of the tourist spots there.
A. when
B. from which
C. during which time
D. since when
网友回答
A. when
B. from which
(答案→)C. during which time
D. since when
解析：句意：怀特一家呆在英国有半个月了，在那期间他们参观了那里的大多数的旅游胜地。这里是定语从句，先行词是half a month，从句中缺少的是时间状语，during which time表示在这半个月里，根据句意故选C。