—What’s the matter Ann?You look sad.—Oh nothing much.As a matter of fact Iof my friend bac

问题补充：

—What’s the matter,Ann?You look sad.

—Oh,nothing much.As a matter of fact,Iof my friend back home.

A. think

B. have just thought

C. had just thought

D. was just thinking

答案：

A. think

B. have just thought

C. had just thought

(答案→)D. was just thinking

解析：本题考查动词过去时态。其语境意思是:“怎么了？安娜，你看起来有点儿忧伤。”“噢，没什么。事实上，我（刚才）只是在想念我家乡的友人。”答语中“Oh,nothing much.”暗示安娜已从思绪中返回现实，刚才回忆的过程应该用与过去有关的时态来表达，所以D项为正确答案。