By the year 2010, scientist probably ______ a cure for cancer.

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问题 By the year 2010, scientist probably ______ a cure for cancer.

选项 A、will be discovering
B、are discovering
C、will have discovered
D、have discovered

答案C

解析表示在将来时间里会完成的动作，用将来完成时。by the year 2010意为“到2010年为止”。

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英语

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