根据汉语翻译写出对应英语你认为哪一张画最好看?Which （ ）（ ）（ ）is the nicest picture.我写Which （picture） （you） （think）（ is the nicest picture到底对不对?我觉的是对的但是正确答案是：Which（ do） （you） （think） is the nicest picture是不是应该写Which picture that you think is the nicest picture？

do you think做插入语，
在特殊疑问句中如果有插入语you think ，那么提前you think的助动词do,剩下的是陈述语序。
记住：一定要提前助动词do，所以Which picture you think is the nicest picture？不对
记住句型：wh-疑问词 + do you think + 陈述语序。
如：
who do you think will be our monitor?
where do you think he came from?
which do you think he likes?
why do you think he told a lie?
whom do you think he will give the gift to?
How do you think he solved the problem?
如果你写成Which picture that you think is the nicest picture？就对啦，这是宾语从句，就不是插入语了。

Which picture do you think,之所以要填do是因为原句中还未有动词作谓语,所以要补充一个do用作谓语.