What the doctors most was that they could not find the cause of the disease.
A. astonished
B. puzzled
C. surprised
D. amused
网友回答
A. astonished
(答案→)B. puzzled
C. surprised
D. amused
解析：astonish“令人吃惊”；puzzle“令人迷惑”；surprise“令人吃惊”，程度小于astonish；amuse“令人发笑”。由句意可知B项为正确答案。