2. 外语
  3. Since I began to work here three years ago, this factory ______ in size.

Since I began to work here three years ago, this factory ______ in size.

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问题 Since I began to work here three years ago, this factory ______ in size.
选项 A、had doubled
B、has doubled
C、doubled
答案B
解析 since…表示过去某段时间起到现在的，谓语用现在完成时。
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