He the Army by the end of 1989.He in the army since then.? A.joined;is B.has joi
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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?
试题答案
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。