选择 D examined
解析:句子结构分析
1.插入语:do you think
2.句子主体:Who the doctor will have examined first.其中:
* 主语—— the doctor
* 谓语动词—— will have examined (将来完成时)
* 宾语—— who (由于提前,口语中 whom 可以用 who 取代),
用汉语的顺序讲就是:the doctor will have examined whom first
翻译:你认为大夫会首先检查完谁呢?