He________ the Army by the end of 1989.He__________ in the army since then.
A.joined;is B.has joined;has been
C.had joined;is D.had joined;has been
He________ the Army by the end of 1989.He__________ in the army since then.
A.joined;is B.has joined;has been
C.had joined;is D.had joined;has been
D
by引导时间状语表示“到……时为止”，用完成时态。到过去一个时间为止就用过去完成时。