Question

My elder brother _____ the army for three years A.has joined B.has taken part in C.has entered for

My elder brother _____ the army for three years
A.has joined
B.has taken part in
C.has entered for
D.has been in
理由或者解释下

Answer 1

D.has been in 表示现在完成式，意思是：我的哥哥已经参军三年了。

in the army 参军

Answer 2

D
join ,take part in ,entere都是短暂性动词，不能与完成时连用，
只有D符合
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Answer 3

A join表加入一个团体，join the army 固定短语

Answer 4

D for+时间要求前面动词可延续，ABC都是瞬间动词