His father ___the Party since 1978.A.joined B.has joined C.was in D.has been in ,为什么?

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His father ___the Party since 1978.A.joined B.has joined C.was in D.has been in ,为什么?

His father ___the Party since 1978.A.joined B.has joined C.was in D.has been in ,为什么?
His father ___the Party since 1978.
A.joined B.has joined C.was in D.has been in
,为什么?

His father ___the Party since 1978.A.joined B.has joined C.was in D.has been in ,为什么?
因为since 1978是一个时间段,而join是一个不延续性动词,所以首先排除AB.然后,C的话,是一个单纯的过去式,没有办法表示出,句意所要表达的——他父亲自1978年以来就一直是在这个党派的意思,所以也排除了.这样就选D了.

因为 B 是终止性动词,不能与SINCE 连用,SINCE 常与现在完成时连用,再排除A 与C
故正确的是D
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因为 B 是终止性动词,不能与SINCE 连用,SINCE 常与现在完成时连用,再排除A 与C
故正确的是D
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since代表完成时,所以排除AC。加入共产党需要动词延续,因为你不能一直在加入也没加进去,是一加就进去了,而且还一直在里面。join不能延续,得把它变be in。所以选D

has been in, since 1978是一个持续的动作,而join是一瞬间完成的动作,故不能用A、B,而since用于完成时,C是过去时,故D