My brother ___(join) the army when he ___ (be) 20 and he ____(be) in it for 5 years

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My brother ___(join) the army when he ___ (be) 20 and he ____(be) in it for 5 years

My brother ___(join) the army when he ___ (be) 20 and he ____(be) in it for 5 years
My brother ___(join) the army when he ___ (be) 20 and he ____(be) in it for 5 years

My brother ___(join) the army when he ___ (be) 20 and he ____(be) in it for 5 years
应该是:
joined was has been in
我哥在他20岁的时候参的军,现在他已经入伍5年了.

My brother joined___(join) the army when he was___ (be) 20 and he has been____(be) in it for 5 years

joined
was
have been

这里的when肯定是个点时间,而且肯定是个过去的点时间,所以用过去时,填joined 和was。
for+一段时间 用现在完成时,终止性动词变成延续性动词。

求采纳~!谢谢
【俊狼猎英】

joined,was,has been

joined(过去时态)
was(be的过去式)
have been(现在完成时)