英语38.Dr.Smith has ten more years before retirement.By then h

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英语38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.
38.Dr.Smith has ten more years before retirement.By then he ______ a cure for the disease.
A.has discovered B.must have discovered C.had discovered D.will have discovered
为什么

D.首先 then 指的是 ten years later,很明显那是将来的时间而答案中只有一个将来时态就是D

英语38.Dr.Smith has ten more years before retirement.By then h 英语句子解释Susan has been in this city for more than ten years. 翻译 Planning for retirement has never been more important. ____a manager ten years before. 高中英语同义句转换More than ten years passed.Then someone else turned Mr zhang has taught more than ten years so he has a lot of e 高一英语题Why does Dr. Smith prefer this laboratoryBecause here h The hospital has been open ____ A.for ten years before B.sin ten years before 和ten years ago 有什么区别? ten years before和ten years ago的区别? ten years _____(pass) since then. (1)Susan has been in this city for more than ten years.