He has__the army for ten years and is now an officer.A.gone into B.joined in C.been in D.come into

C
翻译：他参军十年而且现在是一名军官.
现在完成时中,for后面是时间段,表示这个工作在持续进行着,所以必须使用可延续性的动词,
ABCD都是加入的意思,只不过ABD动词都是短暂性动词,不能延续,所以淘汰这些词需要记下来 靠着理解来记忆比如说start 开始，开始这个动作不能一直进行吧，如果一直进行就不叫开始了，所以它就是短暂性的，下面列出常用的短暂性动词，以及相对应的延续性动词。 arrive→be here begin(start)→be on die →be deadcome back→be back leave →be away (from)fall ill(sick, asleep)→be ill(sick, asleep) get up→be upgo out→be out finish →be overput on→wear 或be on open →be open join →be in或 be a member of… close →be closed go to school→be a studentborrow →keep buy/get→havecatch(a cold)→ have(a cold)get to know →know begin to study→studycome to work→work move to → live infinish/end → be over come to → be in sit down → be seated marry → be marrieddress → be dressed等