题目内容
【题目】Three years has passed ever since _____.
A. he has joined the army B. he joined the army
C. he has been in the army D. he has been a soldier
【答案】B
【解析】
试题分析：句意：自从他参军时间已经3年了。Join是非延续性动词 be in是延续性动词。此处只是强调过去的事实，故选B.
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