she was standing and waiting for a bus that she caught sight of the former President Clinton.
A. It was while
B. As soon as
C. While
D. During the time when
网友回答
(答案→)A. It was while
B. As soon as
C. While
D. During the time when
解析：这题考查强调句，强调的是while she was standing and waiting for a bus，句意是：就是在她站在那里等公共汽车的时候她看见了前总统克林顿选A。