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题目内容
（河北建筑工程学院-大学英语）
(单选题) By 2000, scientists surely( ) a cure for this kind of disease.(本题1.0分)
A、 have discovered
B、 must discover
C、 are discovering
D、 will have discovered
A、 have discovered
B、 must discover
C、 are discovering
D、 will have discovered
参考答案
