What the doctors most was that they could not find the cause of the disease.A. astonished

问题补充：

What the doctors most was that they could not find the cause of the disease.

A. astonished

B. puzzled

C. surprised

D. amused

答案：

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。