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。
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