题干
My brother _____ the army for three years.
A：has been in
B：has joined
C：has taken part in
D：has got to
答案(点此获取答案解析）
A
My brother _____ the army for three years.
A：has been in
B：has joined
C：has taken part in
D：has got to
需要经过下列几步反应（ ）
