---- Tony, you look puzzled. Have you understood me ?
---- I’m sorry. I another problem just now.
A. thought of
B. am thinking of
C. had thought of
D. was thinking of
网友回答
A. thought of
B. am thinking of
C. had thought of
(答案→)D. was thinking of
解析：句意：--Tony， 你看起来很困惑，你理解我说的话吗？---对不起,我刚才在想另一个问题。时间是just now，所以是过去范畴的动作，因为是第一个说话时，第二个人正在思考另外一个问题，所以用过去进行时，选D。