By the time John retires, he______(work)for 30 years.will have worked此题考查的是动词的时态

游客2023-10-06  20

问题 By the time John retires, he______(work)for 30 years.

选项

答案 will have worked

解析 此题考查的是动词的时态。由by+时间,要用完成时态,由于by后面接的是将来的时间,所以用将来完成时态。
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