直到现在，当想起那天发生的是，我还是觉得莫名其妙。 汉译英

Now I still feel confused when I come to think of what happened in that day.

Till now I still can not make head or tail of what happened in that day. make head or tail of 表示弄不清前因后果，搞不清楚状况

until now,I still feel inexplicable when I think of what has happened that day.

up till now, I still can't figure out what happened that day.

figure out 在口语里经常指弄不清楚，弄不明白的意思

Till now I'm still confused at what happened that day.