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单句改错 Since then, I went to Beijing twice.

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单句改错 Since then, I went to Beijing twice.

单句改错

Since then, I went to Beijing twice.

试题答案

答案:

解析:

答案:went→have been

解析:句中含有since引起的时间状语时,句子用完成时态。have gone to是“去了某地”,have been to是“去过某地”。