3
没有原因,固定的
硬要说原因的话实际主语是he left for beijing,不是it,句子做主语表示事件没有时态
It ---------five years since he left for beijing
It ---------five years since he left for beijing
1Was 2have been 3is 4 is going to be
1Was 2have been 3is 4 is going to be
其他人气：137 ℃时间：2019-09-17 19:13:43
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