Since I began to work here three years ago, this factory______in size.

admin2012-07-18  35

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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