I think I was at school I was staying with a friend during the vacation when I heard the

问题补充：

I think I was at school, I was staying with a friend during the vacation when I heard the news.

A. even so

B. and then

C. so that

D. or else

答案：

A. even so

B. and then

C. so that

(答案→)D. or else

解析：or else 用作连词，意为“否则；不然”，其余各项与语境相悖。