_______ 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
A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。