Let’s put off the picnic until next week ,────────the weathet may be bettetrA as B then C if D when

Let’s put off the picnic until next week ,────────the weathet may be bettetr
A as B then C if D when

D when在此句中引导的应该是非限制性定语从句.

Dwhen
When 在这里引导时间状语从句。那个时候天气也许就好些了。

A

答案是D when 是“那时”之意，引导定语从句 。