—Is there anything wrong Bob? You look sad. —Oh nothing much. In fact I of my friends

问题补充：

—Is there anything wrong, Bob? You look sad.

—Oh, nothing much. In fact, I of my friends back home.

A. have just thought

B. was just thinking

C. would just think

D. will just be thinking

答案：

A. have just thought

(答案→)B. was just thinking

C. would just think

D. will just be thinking

解析：这是两个人之间的对话。第一个人说：“有什么事吗？鲍勃，你看起来很难过。” 第二个人说： “哦，没什么。事实上，我在想我的那些回家的朋友。”表示过去某一时间正在进行的动作，需用过去进行时，所以选B。