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外语
By the end of this century, the scientists (discover) ______ a cure for the disease.
By the end of this century, the scientists (discover) ______ a cure for the disease.
admin
2013-11-14
29
问题
By the end of this century, the scientists (discover) ______ a cure for the disease.
选项
答案
will have discovered
解析
本题考查的是动词时态变化。“by the end of”意为“到……时候为止”,所以在出现"by the end of"的句子中,句子时态应是完成时态,通常是过去完成时或将来完成时。本句表示到将来某一时间为止的动作,所以要用将来完成时。试比较:By the end of last week,I had learnt 5000 words. (到上周为止,我已经学了5000个单词。)
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本试题收录于:
大学英语三级B级题库大学英语三级分类
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大学英语三级B级
大学英语三级
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