单选题 The doctor was ______ about what to do with the case; he just couldn"t find the cause Of the illness.
【正确答案】 A
【答案解析】[解析] 本题考查形容词。puzzled“疑惑不解的”，amused“娱乐的”，surprised“惊讶的”，Curious“好奇的”。根据语义，本题正确答案为puzzled。