问题补充：
I can’t believe you got fined for speeding．Iof you to be the most careful．
A. am thinking
B. think
C. have thought
D. thought
答案：
A. am thinking
B. think
C. have thought
(答案→)D. thought
解析：句意：我不能想象你因为超速被付款，我认为你是最小心的。根据句意是过去以为他是最仔细的，用一般过去式，所以选D。
