We have never seen a such good film/ such a good film

We have never seen a such good film/ such a good film

such + a/an + 形容词 + 名词
例如：such a fine day 这样好的天
答案是：such a good film

We have never seen such a good film. 或
We have never seen so good a film.

We have never seen such a good film
We have never seen so good a film