what _ the death of the trees __ unknown to the peasants.

来源：百度知道编辑：UC知道时间：2024/06/11 16:58:11

a. made; remain b. caused; remained
c. kept; remains d. got; remaining
为什么选D？？怎么分析？

我认为选b
我的理由：首先该句的意思是“这些农民对于是什么导致了树木的死亡还是未知的”
what引导的主语从句做主语，与“导致”意思相符的caused，第二个空肯定不能选d，不然该句就缺少了谓语动词。而kept是保持的意思，不选c。又该句子的时态或是现在是或是过去时，第二个空不填remains就填remained所以a也要排除，
综上，选b

get sth doing,使......一直做某事/处于某种状态

使树木死亡的原因对于农民来说一直是个未解之谜

b。绝对是b.之前nc了才会选a.

What were you saying ___ the moment? What ___ feel like to lie on the soft beech... What is the best ___ to get knowledge? The lady ___ what he said was not true what ___ the death of the trees ____ unknown to the peasants. The doctor did what he could ___ the boy's life. ___ can you see near the bed?Liu tao' mother.填what还是who Some day in the future, you shall ___ what you have done. I don't know what was ___ on the playground What a lovely nigth! let's go for a walk ___ the river.