what is/are under the bed,用哪个是正确的?

what is/are under the bed,用哪个是正确的?
what is/are under the bed,用哪个是正确的?

what is/are under the bed,用哪个是正确的?
不看上下文哪个都对.
不明白的可以再问哟!

what is under the bed？

这里的what是代词作主语，what作主语视为单数，所以用is

无论单、复数——问总是用“What is...”

what is under the bed?