.(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

.(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

出自：桂林理工大学大学英语3

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