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

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

______ 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.

B 排除法 ACD意思都不符合

坐观英语大神，看来我选错了

B 时间状语从句

选择when，是“当”的意思，当那里没有雨的时候是很难种树的~~

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