问题详情：
—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
【回答】
D
知识点：动词时态与语态
题型：选择题
