问题描述：
____ four years since I joined the Army.
A. There was B. There is C. It was D. It is
为什么选d不能选c啊?
A. There was B. There is C. It was D. It is
为什么选d不能选c啊?
问题解答：
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问题描述：
问题解答：
我来补答