-- Tony, you look puzzled. Have you understood me ? -I’m sorry. I another problem

---- 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

A. thought ofB. am thinking ofC. 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。

这个问题的回答的对