中文谷It'saboutthreeyears
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问题详情：
It's about three years _________ my brother joined the army.
A. before B. after C. since D. when
【回答】
C
知识点：连词
题型：选择题
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问题详情：
It's about three years _________ my brother joined the army.
A. before B. after C. since D. when
【回答】
C
知识点：连词
题型：选择题
