His brother __for three months.1.has become a soldier 2.has been in the army 非延续性变延续性动词

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His brother __for three months.1.has become a soldier 2.has been in the army 非延续性变延续性动词
His brother __for three months.1.has become a soldier 2.has been in the army
非延续性变延续性动词

His brother __for three months.1.has become a soldier 2.has been in the army 非延续性变延续性动词
2正确
1.become不是延续性动词 你可以这样理“成为……”是一瞬间的事,参(军)了、入(伍)了,马上就能办到的事,不可能参和入这个动作持续三个月
题目中说for three months.你要找一个有持续意义的词.has been in the army 在军队里,是现在完成时,表示发生并持续到现在仍在进行的动作或持续的状态.

他的哥哥已经当兵三个月了!