（2010·重庆模拟）—Alice, you look puzzled．Haven’t you understood it?
—Yes．I of another problem just now．
A. had thought
B. have thought
C. thought
D. was thinking
网友回答
A. had thought
B. have thought
C. thought
(答案→)D. was thinking
解析：考查时态，过去某一时刻正在进行的动作应用过去进行时态，根据题中的时间just now，故用故去进行时态。句意：艾丽斯，你看起来很困惑，你没明白吗？是的，我刚才在想另一个问题，故选D。