I now try to budget a lot of time for editing and polishing; I didn't know to do that then.

我现在试着计划留给编辑和润色以更多的时间，但那时我不知道应该这么做。

youdao

I was out of my mind with fear. I didn't know what to do.

我害怕极了。我不知道该怎么办。

《柯林斯英汉双解大词典》

I was that scared I didn't know what to do.

我非常害怕，以至不知如何是好。

《牛津词典》

I didn't know what else to do, and I read one book that really influenced me.

我当时不知道还能干什么,所以就读了本对我影响深远书

耶鲁公开课 - 1871年后的法国课程节选

I chose English Literature because when I started off a university, I didn't know what it was I wanted to do.

我选英语文学是因为当我刚上大学的时候，我不知道自己到底想做什么。

为何选那门专业？ - SpeakingMax英语口语达人

"It was one of those things, I didn't know what to do, " she said.

CNN: STORY HIGHLIGHTS

"When my dad passed, I really didn't know what to do, " she said.

CNN: Drill team keeps kids off deadly streets

Yet, I didn't know quite what to do with them.

WSJ: HTC One Review: HTC Makes the One the Android to Bea