He is really lucky to have succeeded___others failed.横线是填 when还是as,写出原因,
问题描述：
He is really lucky to have succeeded___others failed.横线是填 when还是as,写出原因,
它们都有当.时候的意思,
它是单项选择AwhenBas Cwhere Dinwhich选答案请写上原因。谢谢
答
as