It is + 段时间 + since... 和 It has been + 段时间 + since...都是表示“从……起已有多长时间了”.
两句型意思相同, 前者是规范说法, 后者是口语说法. 我们做题一般用规范一点的说法的.
It____three years since he joined the army.A
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