His father ______ the Party since 1978 .　　A.joined B.has joined C.was in D.has been inHe _____ the Army by the end of 1992.He ____ in the army since then.A.joined…is B.has joined…has beenC.had joined…is D.has joined… has been为什么第

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Hisfather______thePartysince1978.　　A.joinedB.hasjoinedC.wasinD.hasbeeninHe_____theArmybytheendof1992

His father ______ the Party since 1978 .　　A.joined B.has joined C.was in D.has been inHe _____ the Army by the end of 1992.He ____ in the army since then.A.joined…is B.has joined…has beenC.had joined…is D.has joined… has been为什么第
His father ______ the Party since 1978 .
　　A.joined B.has joined C.was in D.has been in
He _____ the Army by the end of 1992.He ____ in the army since then.
A.joined…is B.has joined…has been
C.had joined…is D.has joined… has been
为什么第一题不能选 has joined ,但第二题可以选 has joined

His father ______ the Party since 1978 .　　A.joined B.has joined C.was in D.has been inHe _____ the Army by the end of 1992.He ____ in the army since then.A.joined…is B.has joined…has beenC.had joined…is D.has joined… has been为什么第
首先你可以看到其实第一题和第二题后半部是一样的题目,都是has been in...since+过去时间.那么为了强调一个状态（即他爸爸是党员/军人)的持续性,我们要用has been.如果has joined...since,那就变成了是【暗示】join这个动作的持续性了（意思就变得很搞笑,就是他爸爸这几十年一直在入党/入军籍,在第一题里没有语境还说可以考虑考虑,但第二题就明显不可能了）
而至于第二题的第一空,我持保留意见,不应该是has joined,而应该是had joined.主要是注意到后面的时间状语by the end of 1992,是过去完成时的标志性状语（当然by the end后所加需得是过去时间）.这里便不是表示join的持续性了,而是表示join这个动作发生在1992年之前,强调动作先后关系.

应为join是一个动作而不能持续，结合语境知第一题强调的是状态，第二题强调动作

has joined 中的join是个瞬息性动词，不能和时间段状语since 1978相匹配。
by the end of 1992是一个时间点,表示截止到这个时间，已经发生的动作，可以用现在完成时。D 应该是had joined.....has been

joined是非延续性动词，不能与时间段，也就是for...， since...连用
第二句的时间是by the end of 1992, 意思是到1992年底为止， （他已经....），不是时间段 。 我想答案应该是had joined吧，过去完成时

join 指的是一个动作，指那一年他参加了这个军队！ 而 has been ，指持续的状态，并不是指一个结果，是自从 1978年以来就在军队里！ 区别就是 “参加‘了’” 和 “‘一直’在军队里”。

在第一题中因为后面使用since，说明是从1978开始，就入党了，是个延续性的动作。
而楼主所钟情的has joined和答案D has been in 都是现在完成时。
现在完成时往往在以下两种情况里出现——
1、这事往往与现在情况有所联系。
2、表示持续到现在的状态。
这样说来，上文出现的似乎是第二种情况。
但是，join是个短暂性动词，has ...

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在第一题中因为后面使用since，说明是从1978开始，就入党了，是个延续性的动作。
而楼主所钟情的has joined和答案D has been in 都是现在完成时。
现在完成时往往在以下两种情况里出现——
1、这事往往与现在情况有所联系。
2、表示持续到现在的状态。
这样说来，上文出现的似乎是第二种情况。
但是，join是个短暂性动词，has joined是指入团那一瞬间的动作，不可能说他的父亲从1978年开始入团一直入到现在。所以has joined是错误的。
而第二句中，有了明确的时间点是在1992年末，在那个时间，他的父亲参军了，这是说在那一瞬间完成的行为。
而后面是自从那个时候，他就一直在军队里了。那就要用延续性的动词。所以选择D

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