By the end of 2010, she (be) ______in Beijing for 4 years.

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问题 By the end of 2010, she (be) ______in Beijing for 4 years.

选项

答案will have been

解析 当句中出现by+一段时间时,动词用完成时。此句中所加时间是将来时间,所以应该用将来完成时。
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