我没把那道题都做完。"了"去掉更好

Maybe you want to say "we(我们wo men)"?

正确的句子是 肯定句：我把那道题都做完了。 否定句：我没把那道题都做完。

https://www.italki.com/article/1032/When-Do-We-Not-Say-%E4%BA%86-When-Talking-About-The-Past This may be help about 了

If what you want to express is not 我们，I think the structure is wrong. The normal sentence should be: 我没把那道题做完（Remove the 都 and 了）. But I still feel that you want to say: 我们把那道题都做完了。