Since I began to work here three years ago,this factory___in size. A.had doubled B.has doubled为什么B解释下谢谢

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Since I began to work here three years ago,this factory___in size. A.had doubled B.has doubled为什么B解释下谢谢
Since I began to work here three years ago,this factory___in size. A.had doubled B.has doubled
为什么B解释下谢谢

Since I began to work here three years ago,this factory___in size. A.had doubled B.has doubled为什么B解释下谢谢
B since 加过去时,主句要用现在完成时,如：
It has been 5 years since I came here.

B.has doubled 从过去某个时候到现在，用现在完成时

现在完成时态，看到since就知道了，从三年前我开始在这儿工作现在这个工厂……

Since表示从我3年前到现在，表示这个是包含现在的
A 的选择意思是过去某段时间增长
B 表示包含现在这一刻

B.has doubled 从过去某个时候到现在，用现在完成时

你好,这个句子的意思是说:
自从我三年前开始在这里工作以来,这个工厂的面积翻了一番.
Since表示从3年前到现在，表示的时间是现在的时间.
只要是SINCE引导的句子都要用现在完成时态.
A是一个过去完成时态,表示的动作是过去之前就已经发生了的.所以不能选....

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你好,这个句子的意思是说:
自从我三年前开始在这里工作以来,这个工厂的面积翻了一番.
Since表示从3年前到现在，表示的时间是现在的时间.
只要是SINCE引导的句子都要用现在完成时态.
A是一个过去完成时态,表示的动作是过去之前就已经发生了的.所以不能选.

收起

应该选B:has doubled
Since 表示某情况自过去某时间点或某个事件以来一直持续到现在.
比如：I've been here since the end of June. 自6月末以来我就一直呆在这儿。

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