一道英语状语从句练习题When shall we go planting trees on the hill?___it begins to rain,so they don`t need watering.A not until B while C till D unless 为什么选C不可以?
问题描述：
一道英语状语从句练习题
When shall we go planting trees on the hill?
___it begins to rain,so they don`t need watering.
A not until B while C till D unless
为什么选C不可以?
答