It was in the mountain__________the American hikers were hik

It was in the mountain__________the American hikers were hiking_____they got lost.
a where that
b where where
c that that
d that where
为什么这一题选a
The weather has been very hot and dry
Yes ,If it had rained even a drop ,things would be much better now!And my vegetables_____
a wouldn＇t die
b didn＇t die
c hadn＇t die
d wouldn＇t have die
为什么这一题选d

第一题考察强调句型和定语从句的使用
it was in the mountain (where the American hikers were hiking) that they got lost.
括号里的就是定语从句用来修饰 “in the mountain”
句子主干很清晰了,就是 it was in the mountain that they got lost.
对过去的事进行的虚拟,if 条件从句里用的时态是had+动词过去分词,那么后面的主句就使用would+have+动词过去分词