Lǎoshī de fǎnwèn ràng xuéshengmen xiànrù le sīkǎo.
The teacher's rhetorical question left the students deep in thought.
Tips
usage
反问句 is the grammar term for 'rhetorical question.' In Chinese rhetoric, rhetorical questions are very common and often end with 吗 or 呢 but expect no answer.