He joined the army last year He a soldier for a year He __the army for a year

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HejoinedthearmylastyearHe____asoldierforayearHe______thearmyforayearHejoinedthearmylastyearHe____aso

He joined the army last year He__ __ a soldier for a year He __ __ __the army for a year
He joined the army last year He__ __ a soldier for a year He __ __ __the army for a year

He joined the army last year He__ __ a soldier for a year He __ __ __the army for a year
1 has been
2 has been in
终止性动词的现在完成时的肯定式不能与表示一段时间的状语连用,要改为相应的持续性动词.

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第一题：has been（从for a year我们可以看出这个句子的时态是现在完成时，所以用have done结构，当他参军了之后，他就成为了一名军人，在现在完成时中，非延续性动词join要转换成延续性动词be表示一种状态，再应用于结构中即可得出has been）
第二题：has been in（从for a year我们可以看出这个句子的时态是现在完成时，所以还是要用have done结构，the army很显然表示一个地点，且in the army这个介宾短语在句子中作表语，而且还需要一个be来做系动词，再应用于结构中即可得出has been in）
第三题：has been，since（句意：自从他参军已经一年了，固定结构：It has been+段时间+since sb. did（非延续性动词） sth.表示某人做某事多长时间了）
拓展：It has been+段时间+since sb. did（非延续性动词） sth.表示某人做某事多长时间了
It has been+段时间+since sb. did（延续性动词） sth.表示某人不做某事多长时间了
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解析完毕，望楼主采纳，谢谢。

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