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?

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一道英语状语从句练习题Whenshallwegoplantingtreesonthehill?___itbeginstorain,sotheydon`tneedwatering.AnotuntilBw

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?
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?

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?
到下雨的时候再种,这样我们就不要给它们浇水了.
到下雨的时候再种,也就是不到下雨的时候不种,所以用Not until

D