He was riding to school(_)he was hit by a car this morning怎么填

问题描述:

He was riding to school(_)he was hit by a car this morning怎么填

when

填where
where后的从句修饰school,因school在后面的句子中充当状语,所以要用where!

绝对填when
这里的when=at that time
早上他正骑车去学校突然就被车撞了

when/as