By the year 2010, scientists probably ______ an effective treatment for cancer.

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问题 By the year 2010, scientists probably ______ an effective treatment for cancer.

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

答案A

解析 “by+将来时间”用作时间状语时,句子的谓语部分一般使用将来完成时。而当“by+过去时间”用作时间状语时,句子的主语一般使用过去完成时。
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