—Sarah, you seem to be a little absent-minded. What’s wrong?
—Oh, sorry. Actually, I of the family party this weekend. I have to make a list of what needs to be bought.
A. am just thinking
B. just thought
C. have just thought
D. was just thinking
网友回答
A. am just thinking
B. just thought
C. have just thought
(答案→)D. was just thinking
解析：句意:--萨拉，你似乎是有点心不在焉，怎么了?--对不起，实际上，我我在想周末的家庭聚会的事。我不得不列出要买什么东西。根据语境可知指的刚才萨拉心不在焉的时候在想什么，故用过去进行时，现在完成时表示过去的动作对现在造成的影响，一般过去式只表示动作发生在过去，跟现在没有关系，根据句意故选D。