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