1. ----You speak Chinese very well.
----Thanks. I _____ it for 4 years when I was in Beijing University.
A. studied B. study C. was studying D. had studied
【答案】A
【解析】考查一般过去时态。句意：我在北京大学曾学习过4年汉语，表明早已毕业，只是陈述在过去某一段时间发生过某一个动作，故用过去时。
2. ----Tommy, you look absent-minded. Have you understood it?
----Yes, I _____ another problem just now.
A. have thought of B. am thinking of
C. had thought of D. was thinking of
【答案】D
【解析】考查过去进行时态。根据时间状语just now可知刚才在想另一个问题。故用过去进行时态。
