B
这里指be in the army"在部队（服役）”这个状态持续多久
C 肯定错,因为主语是“他”,他是军队?!显然不对.如果把C 改为 【has been a soldier"是个士兵“】就对了!
He____for three years A)has joined the army B) has been in the army C) has been an army
He____for three years A)has joined the army B) has been in the army C) has been an army
这题为什么选B不选C呢?
这题为什么选B不选C呢?
英语人气：277 ℃时间：2019-09-03 21:45:07
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