问题补充：
---What did he just now?
---Sorry, I didn’t catch his words. I about something else.
A. speak; am thinking
B. talk; thought
C. say; was thinking;
D. tell; have thought
答案：
A. speak; am thinking
B. talk; thought
(答案→)C. say; was thinking;
D. tell; have thought
解析：本题主要考察的是动词及时态的区别，本题强调的是说的内容，因而用say ，后一个空说的是当别人再说话时，自己当时正在做什么！因而用过去进行时，故选C
