zhè / dào / tí / shí zài / tài / nán / wǒ / yī shí / fā mēng / wán quán / bù zhī dào / cóng / nǎ lǐ / xià shǒu

这道题实在太难，我一时发蒙，完全不知道从哪里下手。

This problem is really too hard; I was momentarily confused and had no idea where to start.