What time of year do you think this picture was taken?请问这句语法

不能把这个句子理解成:主句do you think +宾语从句this picture was taken.
因为宾语从句的从属连词部分是不能提到主句之首的.
其实,这是一个复合特殊疑问句.其结构为:疑问词(组)+do you think +陈述句?
具体句子结构分析如下:
do you think 插入语.
What time of year this picture was taken?是句子主干
其中:What time of year 是疑问词组作时间状语.
this picture 是主语.
was taken 是谓动,
本来,单独的特殊问句应用疑问语序,即:What time of year was this picture taken?
但加了插入语do you think 后,后面部分就要用陈述语序.
句意:你认为这张相片拍摄于一年中的什么时候?