she was standing and waiting for a bus that she caught sight of the former President Clin

问题补充：

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

答案：

(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。