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

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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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Thisfactoryhasbeen______fortwoWeeks.A、openB、openingC、openedAopen在此为形容词，