高等继续教育 / 大学英语语法
正确率:100%
题型描述: 单选题
By the year 2020, scientist probably ____ a cure for cancer.
A.are discovering
B.will be discovering
C.will have discovered
D.have discovered
By the year 2020, scientist probably ____ a cure for cancer.
A.are discovering
B.will be discovering
C.will have discovered
D.have discovered
参考答案: