作业帮he ___for three years.A has joined the army B has been in the army 为什么选B
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he ___for three years.A has joined the army B has been in the army 为什么选B
he ___for three years.A has joined the army B has been in the army 为什么选B
he ___for three years.A has joined the army B has been in the army 为什么选B
因为join是一个短暂的动作,填完表,到军队上报过道,就算是入伍了.
而be in the army则是持续性动作,所以在现在完成时里,选B has been in the army
B has been in the army
因为join不是持续性动作，不能使用现在完成时。
join 短暂性动词 短暂性动词用于完成时时不与for+一段时间连用故改为 be in
因为join是强调动作，B选项强调的是他从军三年的状态。
因为句子后面有时间段 在现在完成时中 如果有for加时间段和since加时间点 那么就要求动词必须是延续性动词 就比如说这道题 join不是延续性的 所以就要用be 明白了么？
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he ___for three years.A has joined the army B has been in the army 为什么选B
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