this is the school where i studied for 3 years

1.This is the school ()I studied 3 years ago.
A.where B.when C.which 为什么选A
2.I'm sorry you have missed the train I ( ) 10 minutes ago.
A.left B.has left C.had left 为什么选 A

1.定语从句,完整从句应该是:I studied in the school 3 years ago.改成从句后少了介词,故用in which=where.
2.因为有个ago,明显的一般过去式的标志.
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