---Alice, you look puzzled, Have you understood it?
---Yes．I another problem just now．
A. l have thought of
B. am thinking of
C. had thought of
D. was thinking of
网友回答
A. l have thought of
B. am thinking of
C. had thought of
(答案→)D. was thinking of
解析：考查时态：根据句意：--Alice，你看起来很困惑，你懂了吗？--是的，刚才我在考虑另外的问题。说明think of another problem是刚刚正在发生。用过去进行时。选D