单选题_______ she was standing&

问题补充：

单选题_______shewasstandingandwaitingforabusthatshecaughtsightoftheformerPresidentClinton.A.It was whileB.As soon asC.WhileD.During the time when

答案：

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。