Her brother_____the Party since 1978.A.joined B.has joined C.has been in D.was in

问题描述:

Her brother_____the Party since 1978.A.joined B.has joined C.has been in D.was in

has been in,since 1978是一个持续的动作,而join是一瞬间完成的动作,而since用于完成时,
所以选C