Let's put off the picnic next week,（ ） the weather may be put off.为什么不能用as?

Let's put off the picnic next week,（ ） the weather may be put off.为什么不能用as?
Let's put off the picnic next week,（ ） the weather may be put off.为什么不能用as?

Let's put off the picnic next week,（ ） the weather may be put off.为什么不能用as?
题目有问题：the weather may be put off?
答案估计是when,它引导非限制性定语从句,when在从句中充当时间状语.
as不好理解,没有when更合适.

as前不能加逗号