题目内容：
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
参考答案：
选择题：By 2000, scientists surely( ) a cure for this kind
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A、 have discovered
B、 must discover
C、 are discovering
D、 will have discovered