My headache is killing me. I it was going away. But now it’s getting worse and worse.A. t

问题补充：

My headache is killing me. I it was going away. But now it’s getting worse and worse.

A. think

B. thought

C. have thought

D. had thought

答案：

A. think

B. thought

C. have thought

(答案→)D. had thought

解析：had thought原以为，和but形成对照，而thought只是单纯陈述过去的动作。