By the year 2050, scientists probably______a cure for cancer.

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问题 By the year 2050, scientists 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 本题考查动词时态。“by(the time/the end of)+表示将来时间的短语或句子”为将来完成时的标志。句意为:到2050年,科学家们将可能已经找到治愈癌症的方法了。
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