—What did the teacher say just now?---Sorry. I didn’t catch it. I about something else.A.

问题补充：

—What did the teacher say just now?

---Sorry. I didn’t catch it. I about something else.

A. think

B. will think

C. was thinking

D. thinks

答案：

A. think

B. will think

(答案→)C. was thinking

D. thinks

解析：句意：老师刚才说什么了？——抱歉，我没听懂。我正在想一些别的事情。结合语境可知下文描述的是过去某时正在进行的动作，故用过去进行时态。选C。