求大神解答被动语态中的句子成分问题！

毕出SC的书中例题：
1.A cave in southwestern south Africa was used as a paint production workshop 这句话为什么是SVOC 完全找不到C的位置

2.Egypt appears to have been affected more than its westerly neighbor 也是SVOC 问题同上

求大神解答！感谢！