第一题：C has been in the army 表示状态 可以和一段时间 连用
第三题：B for a month 表示 一个时间段,所以用现在完成时态.因为是一段时间内的,所以排 除A和D的瞬间动作动词
第四题：B 先判断出用完成时态,然后副词already 放在have 后面
第五题：B 通过left判断出用一般过去时
1.Li Hong has ________ the army for 2 years.A.joined B.be in
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