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his father ____the party since 1978 A.joined B,has joined C.was in D.has been in.求详解

题目详情
his father ____the party since 1978 A.joined B,has joined C.was in D.has been in.求详解
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答案和解析
D
join 是终止性动词,它的现在完成时的肯定式不能与SINCE 连用,排除B; SINCE 常与现在完成时连用,现排除A C