______ there is no rain,it's difficult to plant trees.A.Wher

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______ there is no rain,it's difficult to plant trees.A.Where B.When C.WHich D.How 要原因

选 B when 引导的是时间状语从句,意思是“当没下雨时.”
Where 引导地点状语,但是这里跟 there is no rain 是不搭配的
which 用于定语从句,不能用于句首.
How 是对行为方式提问的,而这里不是问句,也不是 how to do sth 结构
翻译：当没有下雨的时候,植树是很困难的.

______ there is no rain,it's difficult to plant trees.A.Wher It's March now,( )time to plant trees.Look!There is a little There is too much _____,so we can't plant trees here.It's to 英语首字母It is March now.It is time to plant trees.Look!There is （首字母填空）It is March now.It is time to plant trees.Look!There It is hard _____ flowers is the rain a.plant b.to plant c.pi It is difficult to live where there is no matter. 英语翻译It is March now.Spring is here.It's time to plant trees. It is March now.spring is here.It’s time to plant trees（植树）. It is March now. It is time to plant trees.Today is a s____d it's a lonely village.it is ______.a.far b.far from any wher best,it,is,plant,because,warmer,it's,to,trees,spring,in