We didn't find water and grass_____we had passed several villages.选:until?after?我觉得填after.请问大家觉得呢?可答案是until.我觉得前面过去时,后面是过去完成时阿.

We didn't find water and grass_____we had passed several villages.选:until?after?我觉得填after.请问大家觉得呢?可答案是until.我觉得前面过去时,后面是过去完成时阿.
We didn't find water and grass_____we had passed several villages.
选:until?after?
我觉得填after.请问大家觉得呢?
可答案是until.
我觉得前面过去时,后面是过去完成时阿.

We didn't find water and grass_____we had passed several villages.选:until?after?我觉得填after.请问大家觉得呢?可答案是until.我觉得前面过去时,后面是过去完成时阿.
until
not until形式
如果想用after的话,同一句话可以表达为
we found water and grass after we had passed several villages

until啊，not…until

until
not...until的意思是直到..才
直到我们经过了几个村庄以后,才发现了水和草地

是应该until ，
not until是固定的用法，after用在肯定句中居多
这里选择，不要太考虑时态